No more Mario stages, please. We already have two, we don't need a repeat of the abysmal 3DS stage select. Only exception would be a Mario and Luigi stage. Unfortunately, I already hear Rainbow Cruise rearing its ugly head......
On subject, unfortunately they decided to use the bullshit "dull, lifeless stage with lava/acid" for Metroid representation for like the fifth time, but I'd like to see Torvus Bog or Sanctuary Fortress from Prime 2 as a stage before I die. Hell, anything from Metroid that isn't a goddamn acid, lava, or dark/dingy place would be great. Oh well, there's always Smash 5.............until they decide to use Bryyo: Fire Side for the new stage.
An actual new Kirby stage would be great. My personal preference would be a Kirby 64 stage that shuffles through the different planets from Pop Star all the way to Dark Star and maybe having O2 as a boss. I wouldn't mind an Epic Yarn stage based on the Sweets World or Future World or a Factory or Another Dimension stage from RTDL. If there is seriously no new Kirby stage, I'm going to lose serious hype.
Porting over Magicant from the 3DS version would be ideal since I highly doubt they're going to make an EarthBound/Mother 3 stage exclusively on the Wii U and it'd be better than shitting out Onett for the second time and calling it day (even though I like that stage). Probably too busy making a second KI:U stage for Wii U. If they seriously do make a new Mother stage, I would be absolutely shocked, to say the least. Moonside, Thunder Tower, or Saturn Valley would be my top three choices.
A NES-themed stage that cycles through different NES games like Duck Hunt, Gyromite, and other small titles that otherwise wouldn't get repped would be a nice stage for ROB and Duck Hunt Dog. Flat Zone 3 is almost a guarantee since FZ2 was shat out on the 3DS.