Ftilt, fair and dair all seem unchanged. Dtilt seems similar but it's hard to tell if what I saw in the screenshot was dtilt or a jab.
Fsmash is that awesome new jumping drop kick with both feet. It's definitely fsmash, one clip shows it charging for a split second.
Dash attack is new, looks like a much weaker version of his new fsmash with only one foot.
He has a new aerial move that on first glance appears to be a Nair, as it is similar to Kirby's. However frame by frame analysis indicates it may be uair or even possibly bair.
Dair and Fair are both shown to be unchanged, though they were only shown for a brief moment so it's hard to be sure.
Fire Breath looks to have a much higher initial horizontal range than in Brawl or Melee. Angling up and down mechanic hasn't been seen yet but I doubt it's been removed.
Other three specials look to be the exact same as Brawl, though Down B has a huge horizontal hitbox on startup from the ground. Hasn't been seen connecting yet so it's unclear if it'll hit up into the downwards slam, or just be a kill move.
Haven't seen Utilt, usmash or dsmash yet. Also haven't seen 2 of the aerials but it's hard to be sure which one that spinning one is.

Ftilt and fsmash seem to be unchanged from previous entries. Should be noticed they have quite a large range like Brawl, rather than a tiny range like Melee's.
There's a clip where DK initiates an attack and gets literally one frame in before getting hit out of it, but I slowed it down and I'm pretty certain it's his Usmash from previous games, so that's likely unchanged.
Grab, pummel and fthrow are all shown to behave exactly like in past entries.
Fair and bair look the same, but bair seems to have a hitbox that is almost above dk, and the meteor smash hitbox on fair seems to be a little more generous in terms of actually hitting with it.
Nspec and dspec look exactly the same so far.
Spinning Kong seems more angled on the ground, definitely has super armour on early frames. Clearly gaining less vertical height in air than in Brawl/Melee, but also lasting a lot longer, so it'll probably grant a ridiculous horizontal recovery.
Haven't seen forward special at all yet, but I'd be surprised if it's changed. Dash attack also hasn't been seen so a lot of fans are theorising that it's finally been changed to the iconic roll. I'm not sold either way. Dsmash, dtilt, utilt, dair, nair and uair just straight up haven't been shown in any footage yet.

Jab + rapid kick unchanged from Brawl. Dash attack, all three smashes, ftilt, uair, fair, bair and nair are all exactly the same animations as in Melee/Brawl. Not enough of any of them were shown to determine animation speeds or hitbox properties yet, though usmash looks like it might have a wider horizontal range than previous games.
Utilt, dtilt, dair, and all throws have not been shown yet.
His specials all seem exactly the same except for Reflector which hasn't been seen at all yet, so no word on whether we'll get our Melee shine back.

Dash attack is notably the same as Brawl version so far. Note that Kirby's melee aerial hammer was still in the early brawl footage, so this may change.
Vulcan Jab, fsmash, nair, fair,and dair have all been shown to be unchanged.
Grounded hammer is the same as brawl/melee, aerial version hasn't been seen yet. Final cutter has been seen in screenshots but not in footage, so it's hard to tell how fast it'll be. Down B is also shown to be the same as usual. Interestingly only the Thwomp transformation has been shown so far.
Inhale hasn't been shown yet, it's probably not finished.

Jab combo, ftilt, dash attack, fsmash all shown to have exact same animations as in Brawl. Nair and fair look very similar but it's harder to be sure that they're the same. Nair looks like it might be more powerful but no percents are shown in the footage wherein it connects so Mario might've just had high percent.
Dair is also returning.
Nspec and Dspec notably have the same Twilight Princess designs for Bow and Bombs that they did in Brawl. Fspec hasn't been shown at all yet but based on this it's likely it'll be the Gale Boomerang again.
Uspec looks to have more Y Link-like properties in terms of how the multiple hits connect and carry when used in the air. This is an attack property usually reserved for the alternate Link of the cast, which indicates to me at least that there may not be one this time. Up special has not yet been shown charging on the ground, so it's up in the air if this mechanic will return.

Mario's entire moveset other than his down and back throw has been shown to be the same as in Brawl. However, dsmash and ftilt are both clearly MUCH faster moves than they have been previously, and Usmash seems to have him jump higher off the ground.
Technically we haven't fully seen his down air yet. In the footage where it's 'shown', the player initiates it right before hitting the ground (like a frame or two). The landlag animation that plays however is exactly the same as Mario's down air land lag animation from Brawl, indicating it'll be the mini mario tornado again. This is supported by the fact that the FLUDD is still his down special.
Speaking of FLUDD, it seems to take a longer time to fully charge than it did in Brawl, but it's hard to be sure. It's also not shown actually connecting with an opponent yet, but the one time it was used, we can see the graphical effect is a lot more powerful and forceful looking than in Brawl.

Jab, Ftilt and Nair all appear to just be the energy pellet, allowing Mega Man to shoot while walking and jumping. Fsmash is the charged mega buster. The projectile changes size with charge, but it's unclear if range changes as well, as it dies on hit and we've only seen one clip where it doesn't connect with a foe. In that instance it was about half charged and reached a little further than Olimar's fsmash before disappearing.
Utilt is the shoryuken and dtilt is the slide kick. Both give Mega Man a pretty decent speed boost. The slide kick boosts him forwards and the shoryuken launches him upwards. However, I think that the utilt doesn't ever actaully leave you airborne, as when he's shown landing from the uppercut, he has a different pose than he does when landing from jumps in other footage, leading me to believe that the landing is still part of the attack animatino.
Usmash is Spark Shot and Dsmash is Flame Blast, both are multihit and quite powerful. Dsmash did a ridiculous amount of damage in the gameplay footage, on par with Peach's melee dsmash.
Super Arm is his grab, and he appears to just hold that one pose. Uthrow and Fthrow are the only throws we've seen so far, and both just have him toss the foe in that direction. Would be surprised if dthrow and bthrow didn't follow suit.
Fair and Bair seem very similar to one another, Fair being Flame Sword and Bair being Slash Claw. Slash Claw seems to be a disjoint and multihit.Should be noted that in one clip, Mario used his forward air and connected with the flame sword with no knockback being received by either of them. Not sure what happened there.
Uair and Dair are both projectiles in their respective direction, Dair is Hard Knuckle, a meteor smash. Uair is Air Shooter, which we haven't seen actually hit a foe in any footage yet. Note that air shooter only shoots out one whirlwind, unlike the 3 fired in Mega Man 2.
Either Metal Blade = nspec and Crash Bomb = fspec or the other way around, it's unclear which, but there's nowhere else for them in the moveset. I think it makes more sense for Metal Blade to be nspec, as it can be fired in the 8 cardinal directions, and it makes sense for you to press it once to create one, and then tap a direction to throw it. Also, footage exists of Crash Bomb being used by Mega Man while he's walking, which makes a lot more sense if it's an fspec. Note that Metal Blade sticks in the ground if it hits terrain and can be picked up by other characters like an item.
Uspec, Rush Coil, appears to act almost exactly the same as Sonic's spring in brawl, right down to Rush staying behind for use as a spring again later. Unclear if he acts like a projectile when used in the air above a foe.
Dspec is Leaf Blade. Spawned and then launched forwards, probably with another button press. Seems like it can cancel out projectiles and deal damage to a foe, but it loses a leaf each time it does either, giving it four uses before disappearing. No footage shows it in use while Mega Man is running on the ground, so it may automatically be thrown if you try to walk. However I don't believe directional input causes you to throw it, as he is seen moving horizontally in the air while the leaf shield is active. It's probably a second press of the B button.

Oddly enough 99.9% of Pikachu footage so far shows him only jumping around and doing special moves on occasion, which leads me to believe that he was only barely completed in time for the trailer and reveal. The only a move he's seen using at all is his dash attack, and it's in the later released footage of Wii Fit Trainer's reveal. Literally everything else has been a special move or just standing there.
All four of his special moves have been shown, and are all apparently unchanged from Brawl. Quick Attack is only briefly seen, and it goes immediately off screen, so I can't tell what landlag and recovery power will be like.

Something that looks a lot like his brawl jab combo appears briefly in some footage, and in a screenshot he's in a pose very similar to his brawl Fsmash, leading me to believe these moves are unchanged.
Nair and Uair are both seen in the 3DS footage, and both look essentially the same as in Brawl. He starts to use his Dair but lands part way through. It appears to also be unchanged but it's hard to be completely sure.
Nspec is the only unchanged special move. A screenshot actually shows him aiming the arrow diagonally, indicating he can aim in more directions than just up and forwards. However it's also possible the screenshot was taken between changing directions, and that up and forwards are still the only angles. No footage has shown Pit steering the arrows around like you could in Brawl, but I'd be surprised if this was removed.
The Upperdash Arm I at first thought was either his Dash Attack or his Fspecial, but a screenshot of the move being performed in the air pretty much confirms it's his fspec. This seems consistent with the fact that we haven't yet seen Angel Ring return in any footage or screenshots, and was practically confirmed in the Direct video when we see the move performed from standstill. It appears to be an uppercut even when used in the air, unlike Captain Falcon's forwards special. Hard to be sure of any properties other than those.
Uspec looks quite different, he's only seen using it in the 3DS footage, in which he uses it out of a run, and launches up at an angle slightly higher than 45 degrees. The motion appears to be similar to Lucario's up B but with no windup and slower overal motion. However the footage only very briefly shows the move and it's hard to be sure of anything.
The Guardian Orbitars are pretty much 100% his new Down Special, as they are shields like his old one (which has not been shown) and they appear to be able to be held indefinitely. Have only been shown once and not in usage against any attacks, so it's unclear what the exact properties are against physical attacks, but it can be assumed that they'll reflect projectiles.
Pit hasn't yet been shown gliding. I'm sure it'll return but it's something to note.

We've seen almost all of Samus's moveset. Utilt, dash attack, dsmash, uair are all entirely unchanged. Ftilt is the same animation but is noticeably a lot faster than it was in either Melee or Brawl. Bair is also very similar but overall appears to have a lower hitbox compared to Samus than in Melee/Brawl. Unknown if this'll affect knockback direction.
We see what looks like the startup frames to Up Smash in one screenshot, though the move hasn't been shown yet. Down Smash appears to be unchanged, though it hasn't been seen actually hitting a foe so it's unknown if it's unique 'inwards' knockback direction properties are returning. Finally, forward smash has the same basic animation, but with a mario style explosion disjoint at the tip, which is totally new and will give the move even more range. The move already had insane range though, so I speculate the arm canon's hitbox will have a noticeably lower kill power than the explosion.
Charge Shot is back with no apparent changes, though it should be noted that the fully charged projectile is the smaller one seen in Brawl rather than the larger than Samus one that was in Melee and 64. Again, remember that Kirby's Melee hammer was in early brawl footage so this is subject to change.
We've seen Homing Missile used in a few different clips, and the Super Missile in one screenshot. Homing Missile acts the exact same. Can't yet see if Super Missile has the same movement speed that it had in Melee/Brawl, but as Homing Missile is unchanged it's probably safe to assume Super hasn't either.
Screw Attack we haven't seen at all yet. It's probably unchanged though, as it's had almost the exact same properties in all three games.
Morph Ball Bomb hasn't been seen outside of screenshots yet. Looks to be the same, but it should be noted that one screenshot shows an unexploded bomb next to Samus charging her B, which indicates that Bombs may take longer to explode than they have in previous installments, giving Samus time to land next to the bomb and start charging.
Her Final Smash is one of the few that's been shown. It's still the Zero Laser, but it's quite different. The size of the beam increases to full screen almost immediately, whereas in Brawl it started quite small and expanded until it covered the whole screen. It seems that the aiming up/down mechanic returns. The footage ends too quickly to tell if Samus starts to lose her armor. I'd like to believe that this means Zamus is now her own character slot, but I'm more inclined to think that this was just because they weren't ready to confirm her yet.
Overall Samus seems more mobile in the air than she has previously. Her fall speed is higher than that of Brawl's, but still slow enough to be on par with Melee's. Probably a physics change to go with her more streamlined Other M appearance.

I'm the least certain of Villager's moveset, had a lot more trouble with him than the other characters. I'm pretty certain of some stuff though.
Ftilt is the umbrella swing, utilt is waving a stick around above him, and down tilt is the weed pull. These were shown in quick succession in the Direct footage and I'm 100% certain that's what these moves are.
The flowerpot drop is definitely his dash attack. I believe it acts somewhat like a projectile, as it seems to stay in the ground a little while if it misses, but breaks if it actually hits someone.
The shovel move shown is his down smash, and not a special move. In both clips where it is shown, he uses it once on either side of himself, like most Down Smashes. Also, slowing the footage down shows that he actually charges up for a couple of frames before using the shovel, and it's clearly the smash attack charge visual effect being used.
The fireworks he uses are definitely his up smash.
The boxing glove punch he's seen using in a few screenshots are believed by some to be his forward smash, but I'm more inclined to believe they're his jab, as he's wearing boxing gloves on both hands, which indicates he's doing a two hit combo and not just punching with the first hand. It's not unreasonable to think that his forward smash would be a two hit combo though. We've also seen no other moves that could be his jab, so there's that.
The slingshot attack is very clearly his back air. He's also seen in one screenshot swinging a turnip below him in the air, and it's probably his down air. The screenshot might just be partway through him swinging it all around him though, so it might also be his nair. It's hard to tell in the screenshot if he's actually still holding the turnip, so if it's his dair it might be a projectile of some kind, where he drops it beneath him.
I'm fairly positive that his pocket item move is his neutral b. The only other logical option is down b, and villager hasn't been shown doing the pocket animation out of a crouch in any footage. Note that the projectile has the exact same properties when it's launched back, as charge shot/fireball come out at the same speeds as they were pocketed at, and homing missile can be seen starting to home in on Samus when he throws it back.
The Balloon Fighter helmet is his up special obviously, but it's hard to determine the exact mechanics, as it can only be seen very briefly in any footage. Probably works with actual Balloon Fighter physics, where a button press gives you upwards momentum.
This leaves two moves left, his Bowling Ball, and the plant/water/kill tree thing. They're both definitely special moves, so I'd say one of them is forward special and the other one is down special. I think the sapling one is probably down special, as it can obviously only be used on the ground.
Bowling Ball is definitely a projectile, it can be seen that it doesn't disappear after hitting a character and continues to fall. We've yet to see the move used on the ground, so it's unknown if the bowling ball will roll forwards along the ground or if it'll just bounce to a stop.
The sapling move is really interesting. We're shown that it goes in 4 stages. Planting the sapling, watering it into a tree, and then 2 swings of the axe to knock it down. The axe has never been seen used anywhere other than on the sapling, so I'm fairly confident that it's part of the move. In addition, the third stage of the tree is where it has an axe chop mark in it, indicating further that the axe is specifically there for chopping down the tree, and it can't just be done with any attack. It's not entirely unreasonable to think that the axe might be forward smash though.
We've yet to see Villager use the net in any actual gameplay, and while I was at first under the impression it'd be his grab, I'm more inclined to believe he'll be doing that with the fishing line, as that gives him a tether and overall seems to lead better into actually throwing the foe. Not really sure where the bug net will come into the moveset anymore.

Jab appears to be a 3 hit combo, one hit with the hand, the next with the knee and the final a lunging attack with the elbow. First hit seems to hit on both sides of her.
Ftilt looks like a more stretched out version of her first jab. Her other arm swings backwards, indicating that it may be able to hit on both sides of her.
Utilt is a very low range attack compared to the rest of her moveset. Swings her arm upwards from a crouching pose.
Dtilt is an odd lunge forwards with her knees from a pushup position. Doesn't appear to give horizontal movement, as she flips back to her previous position after performing the lunge.
Dash attack does an odd crouching slide with her arms poised out in front of her. It can only briefly be seen.
Her fsmash is that stomp/lunge thing. Can very clearly be seen hitting someone behind her in one clip, much like her ftilt and jab1 appear to be able to do.
Her usmash is the famous 'tree' pose from the reveal trailer, and her dsmash has her kick out behind her on one side and punch in front of her on the other side from a pushup position.
Her uair is an upwards clap that she's seen doing in one clip, where she clamps her feet and hands above her head, and her Dair is a stomp, not unlike Capt Falcon's. Doesn't connect in the footage but very likely to be a meteor smash.
It's hard to be sure what's going on with that volley ball move. It's clearly a projectile of some sort. She spawns it and then headbutts it away from her, but in one clip she appears to headbutt it upwards, while in another it launches more at an angle. She also quite distinctly does a jump upwards to headbutt it, making it almost look like the headbutt is it's own aerial move. This however seems unlikely as the clap is very clearly her up air and the headbutt wouldn't make sense as anything else.
Up special is that hula hoop thing seen in a few different clips.
Her Final Smash is the only one other than Samus's to be shown so far. Not much to talk about with it.

Not much to discuss here other than Arena Ferox definitely being the setting for the stage. Several scenery pieces and textures are taken right out of the Arena Ferox from FE: Awakening.
So far no stage interactivity or movement shown, but we have very little footage of the stage.

Not much to say here, though it's neat that the 3DS gets a different Battlefield to the Wii U. Both versions look very pretty.
Both versions also show the time of day mechanic from Brawl returning, though the 3DS version exclusively shows the weather changing in some screenshots. Highly doubt it'll affect gameplay.
In both versions, leaves are seen to blow past the stage on the wind. Neat effect.

The paths that the platforms follow can clearly be seen disappearing and rewriting themselves in some footage, indicating that the paths are not always the same and that the platforms will move in different patterns.
I believe the Yellow Devil to be a stage hazard rather than a boss of some kind. Seems to fit better with what we know about the game.
Only seen in Wii U footage so far. Raises the question of whether or not we'll also get a home stage for Mega Man in the 3DS version, and whether or not it'll be different to this one.

3DS exclusive stage, obviously thanks to Ocarina of Time's remake on the 3DS.
No stage gimmicks shown yet. Should be noted that in one clip, Kirby is sent flying a very long way to the left and survives, indicating that the stage is either very large, or that the bridge is on the right side of the stage rather than at the center as some screenshots indicate.

I believe this to be a scrolling stage in the vein of Rainbow Cruise. As that stage may not be returning, it makes sense for its replacement to be introduced in this game.
Seems to take mostly visual cues from Mario 3D Land, but also some from New Super Mario Bros 2. Both 3DS titles.
Only two distinct areas have been clearly shown so far, leading some to believe they may not be scrolling, and rather two separate stages. One area is on the ground with Peach's Castle off in the background, and the other is over the seas with spike pillars sticking out of the water.
No gameplay footage or screenshots show the outside the castle area other than the official render of the stage's layout. It seems unlikely that a stage would be revealed with this kind of screenshot alone and never shown elsewhere, leading me to believe it is not its own stage but rather the starting point for the scrolling stage. Also note that an arrow sign pointing to the right is in the BG of said screenshot, indicating that the camera will start scrolling in that direction. It should also be clear to anyone who has seen the footage of the 'above the water' portion of the stage that the platforms are dynamic and change position, as one of them can be seen being destroyed by a spike pillar, and the others can be seen moving around to change the layout.
Further evidence that it is a scripted scrolling stage like Rainbow Cruise is that a second clip, also showing the spike pillar destroying the bottom platform, when compared with clip in the e3 trailer, shows the other two platforms lining up at the exact same time. This indicates that the same set of events happen to the stage in the same order and at the same time each time the stage is played.
Even more support! There's a screenshot showing a hill/mountain with mario style textures/patterns, but the tree next to it isn't similar to the trees seen in either the peach's castle scene or the above the water scene, indicating at least one more part of the stage exists. It's unlikely to be its own stage as I don't think they'd show off a new stage in all this footage with only a single screenshot when all the others got at least a couple of screenshots and some video time.

Pretty much nothing to say here other than it may mean the removal of the Nintendogs Assist Trophy.

Very obviously the successor to Isle Delfino from Brawl. We see battles take place on a number of different locations around the floating island, as well as gameplay on top of floating platforms which fly around Skyloft. The layout of the floating platforms segment appears to differ between screenshots.
Should be noted that only two different layouts for the floating platforms segment have been seen so far, which is far less than Isle Delfino had in Brawl. Probably just haven't seen all of them yet, but it does seem like an odd coincidence that all of the screenshots and footage have only shown one of the same two layouts when you consider how much of this stage they've been showing since the reveal.

Platforms can definitely be seen moving in footage, similar to Brawl Smashville's.
Two distinct versions have been shown, one looking more like the style of Wild World, another more based on City Folk. Both are Wii U exclusive so far.
Almost definite that both versions are separate and do not change into one another, as while the front half of the stage looks the same, the back half looks totally different. Also, no footage or screenshots so far have shown any sort of in-between state for the Background, it's always either one or the other. Furthermore, the Wild World version has 3 platforms, while the City Folk version only has 2.
2plat version movement is similar to Brawl's Smashville, the platforms are lined up horizontally and slide until they meet in the center before sliding back the other way.
3plat version movement has not been clearly shown in any footage, but you can see the very corner of one of the platforms moving upwards in one clip, so it appears that this version will have vertical platform movement rather than horizontal for at least one of the 3 platforms.

Obviously the successor to Pirate Ship from Brawl, but actually has more in common with Big Blue.
The floating platform being carried by birds appears to drift to the left and to the right in relevance to the train, and I suspect it will sometimes even be taken upwards or backwards off screen, reminding me of the floating dome platforms that did the same thing in Big Blue.
One screenshot shows Fox on the tracks behind the train, it's hard to tell if he's dashing or in the windup stages of his Forward Special. Either way it indicates that the tracks will work much like the road did in Big Blue. ie you can stand on it but will get carried quickly off screen if you stay there.
Conductor Link I personally believes deconfirms Toon Link from being in the game, but I also don't think it'd be entirely impossible for him to still be present in light of this. I just think it's unlikely.
Also a cool thing to note is that Conductor Link has a super low polygon count, he looks really blocky like he did on the DS.

Appears to be a long flat stage with walk-off ledges. I've only been able to get one very brief screenshot of the overall layout, which appears to be a lowish platform to the left, and two platforms much higher off to the right. Think Battlefield if the right platform was raised to be as high as the top one.
However another screenshot shows two platforms close together, and they appear to be on the left side of the stage. It's hard to be sure because it's zoomed in and at an angle, but it appears to be inconsistent with the overall layout screenshot I took. Suggesting that maybe the platforms move or are different each time the stage is played.
Yeah just found yet another screenshot which shows two platforms next to each other, but at very slightly different vertical heights, which is inconsistent again with either of the other two screenshots I've found. The stage definitely has a variable layout of some sort.
Also note that the platforms look like elongated balance boards, which I think is a really neat touch.

Most common theories I've seen suggest this is the new Final Destination or a Punch-Out stage. I don't agree with either.
I find it unlikely that a Punch-Out stage would be revealed this early unless a Punch-Out character was being shown as well. In addition, the stage is very clearly themed to Smash Brothers itself, with all the logos and text. This doesn't entirely disprove it as a Punch-Out stage but it seems extremely unlikely.
It's also definitely not Final Destination. When Mario and Bowser are seen jumping onto the stage from outside of the ring, they are in their initial jump animations, meaning they are jumping from ground. This indicates the stage is either a walk-off, or at least has some terrain outside of the main platform. In addition, the ropes are shown to act as walls in some footage. The layout is too radically different to the standard Final Destination for that to be what we're seeing here.

I believe this to be a Donkey Kong stage, as out of the characters revealed so far that don't yet have a stage to their franchise, his is the only one that makes sense for this jungle-like environment.
Also the wheel looks quite similar to certain parts of Donkey Kong Country Returns, which is as of recently, a 3DS game. Note that this stage is so far only ever shown in 3DS footage, indicating it is exclusive to that version of Smash 4.
Appears to be possibly a vertically scrolling stage. Not much is shown on the X axis but in the two different screenshots and footage, quite a variance is shown in the height of the stage, indicating scrolling. This also leads me to believe it is a DK stage, as it would possibly succeed Rumble Falls from Brawl.

Hitstun is definitely not cancelable with aerial attacks as it was in Brawl. Several instances of footage when slowed down show characters perform attacks during knockback, but none of them doing so before they're well on their way back down in the knockback arc.
Significant landing lag shown when Mario lands partway through his fair in some footage, several frames longer than it would have been in Brawl. Either landlag is globally a lot higher or L-cancelling is returning.
MOST fall speeds appear to be higher overall. It's hard to tell if this is a global change, but footage of Fox initiating what is clearly a fastfall partway through his up air show him descending much faster than was possible in Brawl. Other footage shows both Mario and Bowser's jump arcs, which appear to reach around as high as Brawl's, but also show that the downwards acceleration towards their max fall speeds is somewhere between Melee & 64.
3DS version at this stage appears to be much slower than the Wii U version overall. While the physics are visibly the same, it seems like the entire game is played in slow motion in comparison. Possibly due to early development, as the game may not yet have been optomised to run on the less powerful system. Note that the Metal Gear Solid 3D Demo ran significantly slower than the final release version.
When Villager's up smash is being shown off, he actually does it out of a crouch. This indicates that c-sticking, or some other method to perform smashes without directional input, is returning.
Almost all tilts that have been shown to be the same animation as in Brawl/Melee are much faster in terms of frame time, on par with and sometimes even exceeding Melee speeds. Mario's ftilt is a good example.
It appears that the shield shrinking mechanic is unfinished as of this build, it can be seen being used for extended periods of time without changing size at all over time.
B reversals very clearly shown in one piece of footage. Not sure why they would ever take it out but this at least confirms it.
Slowdown effect after match ending from Brawl don't appear to be present, but neither are the freeze effects from Melee/64. Rather, the gameplay appears to simply progress at normal speed. Probably a beta element.
Doesn't look like teching has been implemented at all yet, though it's very unlikely to be removed. It hasn't been seen in any footage including the unedited gameplay match played by Sakurai.
Ledges appear to have the larger grab bubbles from Brawl, however, in one piece of footage, Mario can VERY clearly be seen using his up B and going straight past a ledge, so it would appear that characters can once again only grab ledges while not in the midst of an attack animation.