Information seen so far:
Separate games for each system with at least similar engines. IWO, AFAIK, 3DS Mario will play the same as WiiU Mario.
WiiU will have more stages based on home console games, 3DS will have stages based on portable games.
Characters (so far):
Mario
Link
Kirby
Pikachu
Samus (based on Other M looks-wise)
Pit (with new Uprising-based moves)
Donkey Kong
Bowser
Fox McCloud
New Characters (again, so far):
Villager (Animal Crossing) -- Kinda like the Ness/Lucas of this game. Attacks with a lot of everyday objects, and can catch and re-use any projectile attack in the game. Can also grow trees and cut them down on you, and has a moved based on Balloon Fight.
Wii Fit Trainer (Wii Fit) -- No, you heard that correctly. Uses various stretches and fitness equipment to attack. Looks about as quick (and dangerous) as Zero Suit Samus.
Mega Man (classic series) -- This is (so far) the OH MY GOD YES announcement of the game. Very projectile based, with most of his specials and Smash Attacks based on Robot Master weapons (Yes, including the Metal Blade). Also has the Shoryuken/Mega Upper from Marvel vs. Capcom.
Super Smash Bros WiiU/3DS
Moderator: Thanas
Super Smash Bros WiiU/3DS
Not an armored Jigglypuff
"I salute your genetic superiority, now Get off my planet!!" -- Adam Stiener, 1st Somerset Strikers