Seriously. Too many topics, too much time!
We got characters (first and foremost), mechanics, physics, potential move sets for newcomers, potential move sets chances for veterans, online upgrades, possible online modes, leader boards, different online game types, LAN game play (they should totally have it!), online versus, the possibility of online and LAN having more than 4 player games (imagine how awesome 4 vs. 4 would be), the possibility of Nintendo and others hosting online tournaments, online content (like the automatically send stages and pics in Brawl), how Nintendo should upgrade their online, whether Friend's Codes will return (pray, write letters, flame Nintendo; this needs to die!), how the Wii U graphics will work, how the Wii U online will work, the possibility of mics and player/friend chat (rooms), how the Wii U will work, how the 3DS will handle smash, possibly roster, stage, and item difference between the two, possibly 3DS vs Wii U smash battles, how the Adventure mode and/or SSE will work out, the coin launcher, what stages will return, new stages, new franchises, what franchise will get stage/item/character rep, create-a-stage ideas/upgrades, alternate outfits, character DLC, item DLC, online content DLC, alternate outfit/costume DLC, trophies, stickers, new collectables, new items, returning items and their changes, classic modes' future, event matches, All-Star mode, break the targets, the home run contest, how to fix tournament mode, whether or not there will online tournament, the possible return of land on the platform (would be awesome!), the possibility of doing single-player modes with a friend (offline and online), the future of options, the options of items, the options of combining modes (ie: super metal hyper speed heavy bunny hood fights!), new music, the future of music in smash (make the songs at least 3-6 minutes long!), the possibility of adding on music (I want a stage with songs off Diary of a Madman), the possibility of playing any on disc song on any stage (Green Hill Zone on Mushroom Kingdom ftw!
), create-a-characters/Miis, the possible returning Pokéball Pokémon (all of them... please?), new Pokéball Pokémon, returning Assist Trophies, new Assist Trophies, returning bosses (hopefully Rayquaza!), new bosses (hopefully Gigyas!), new SSE enemies, the SSE's plot, the possibility of SSE having more than 2 players playing, the SSE possibly being playable online, as well as new modes that could be added to classic and regular multiplayer modes, etc.
You can go on and on and on forever about stuff to talk about, and I'm pretty sure we've covered at least 90% of it in this thread and the 3DS Smash thread!
Also, I'd do regular Bass over Bass.EXE (he can be an alternate outfit). That and Will (maybe Takamaru since he has yet to be revived, although he could make a future smash bros appearance for sure). Also, who is Will, and why would he be worthy? Plus Zamus would probably happen, since fighting game developers love attractive women (often to the point of perversion), including Capcom.