My "tier list" for most needed character resprites:

S Tier (really need one):
Sonic - Seriously
Lloyd - They didn't change the sprite of Lloyd himself, just his swords

A Tier (could use it after S-Tier gets them):
Tails - If Sonic gets one, Tails could get one soon after or at the same time
Mega Man - Still has his SNES sprites
Wario - Still just has recolored GBA sprites

A- Tier (could live without it):
Sora - Doesn't fit in with SSF2's style, but it looks decent

B Tier (could definitely live without it):
Ness - I just think he looks kinda ehh
Yoshi - Same as above, but not as ehh. Maybe just his idle animation.

C Tier (minor changes, still not necessary):
Fox - I don't really know what they could do with him
Pikachu - 2 beeg
Black Mage - Maybe he only needs a recolor

D Tier (no changes whatsoever):
Everyone else

I speculate we get a "PokéSmash" mode or something like that. You can select up to 6 characters/Pokémon in a row. Each has one stock. Once the forst Pokémon is defeated, the second you chose is brought into battle... Like a Crew Battle, but the other Pokémon stil has its damage... (And maybe they can only use their special moves as well)

Definitely not preferable to Project M's All-Star Versus mode, I'd rather see that than just the same thing but Pokemon-themed.

Online spectator mode, would be great for tournaments

SSB4-like Screen K.Os

I think the screen KO's are already pretty SSB4-like. They don't need much improvement, and I think they're better than Brawl's and Melee's.

No, what would make them better is if they cause the screen to crack/shatter upon contact. That'd give it more effect for the Screen KO.

And on the topic of aesthetics, I speculate they'll add something to indicate a KO is imminent and inevitable, similar to the black and red electricity from Smash 4. Have the characters and space turn all negative or whatnot and have it slow down when an extremely powerful attack comes, and even make it a selectable option of sorts.

1. Lag (on some computers; as if screen ko's aren't laggy enough for me already)

2. Hitlag (can be unfair in a FFA or Doubles). I know you said it's an option, but what would really be the point?

Lloyd doesn't really look that bad IMO. Tails should be an S-Tier considering he's identical to Sonic.

Sorry for "post bumping" but I didn't notice this before.

Lloyd's sprites aren't necessarily bad, they just don't fit SSF2's style. He looks really short too.

Tails, imo, needs a brawlification at the least. Whenever Sonic gets a resprite, I think they could do something similar with Tails, but a full resprite isn't completely necessary.

1. Easy, they could speed up the screen KO to have the effect more feasible than not. And it would have less lag.

2. It could be a type of option set on the menu, known as "Effects" option. And the effects I listed would be "Static Shock", "Zero Negation" and "Devastation". All of this stuff would spice up the game with a bit more quality and whatnot, but again, just speculation.

Fair enough.

Yoshi's Island 64 coming back as a unlockable stage

Score display

I speculate Coin Battles and Stamina modes