^No, we're speculating Assist Trophies.
I speculate Silph Co. being replaced by Butter Building (I know I have ranted a lot about this stage, but it's just so godamn unfair for low jumper users like me)
In Past Stages, I speculate Planet Zebes (N64) (Because in my opinion, it's the best represented Metroid Stage in official Smash Bros. so far)

I didn't mean this to be a speculation topic at all, but apparently we are.

Whoa forgot that fourside also got a resprite, this stage looks so gud now omfg
also lmao dat flying helicopter

The only thing that bugs me is that the buildings in the background on their own layer is very distracting. Not a bad thing because it looks awesome, just looks a little plain compared to the background in melee where you could see more of a skyview of the city below and more higher buildings. A nitpick from me at most.

Anyone else notice that Saturn Valley's music was remastered?

^ It needed to be remade, but I do think the stage needs to be resized to be a bit bigger, some character sprites are massive looking compared to the stage and I hope it get's a resprite at some point.

Shadow Moses resprite please......

Maybe they could just lower down the side scrolling speed for Sliph Co or something, because I find the complex stage design and fast-paced music too good to pass over.

Nice catch!

This demo brought a huge number of new music tracks, between new and touchups. We announced quite a few, but not all. So prepare your ears as any stage might surprise you!

I love them. My favorites songs are Bleach Medley. Majora Mask medley, Hylian Skies and new Saturn Valley ^_^

My favorite music at this point would have to be Battlefield, Final Destination, Silph Co., Casino Night Zone, Dream Land (still!), Mushroom Kingdom III, Hylian Skies, Gangplank Galleon, Chaos Shrine, Lunar Core, Bomb Factory, and Tower of Salvation!

Hoping now for a stage from Golden sun now that Isaac has been confirmed.

Although I've only played through the first 2 hours of the game, so I don't know what it would be.

IMO I think the stage looks find (maybe a touch up in color).

Galaxy Tours is in desperate need of attention. Crateria (mainly the background), Sector Z, Smashville, and Green Hill Zone could get a touch up. Saturn Valley could get a resprite IMO and Princess Peach's Castle and Temple feels too small (compared to Melee's size).

Personal design choices;

Phase 8 - I think the lava sprite needs an update, looks a little 8-bit-ish compared to the stage. The lava (that comes from the top of the screen) should cover the whole stage and not just the capsule you take cover in. (Maybe even have it pouring off the capsule's top to reveal the characters inside.) Also maybe the camera could zoom out when the lava comes down (like Norfair's lava-lanch part of the stage).

Sky Sanctuary Zone - All I would say about this stage is instead of two large platforms, have three smaller ones. But this is just really a nitpick.

^ That'd actually be cool, but then again, I'd prefer we get an original design Final Destination first before other stages getting an FD form. (fourside and hylian skies fd pls)