With the new forum comes a new thread for Super Smash Bros. for Nintendo 3DS/ for Wii U.
Special notes. Transformations will not be a part of this game. Zelda and Sheik are their own selectable characters. Same deal with Samus and Zero Suit Samus. The Pokemon Trainer is also gone with a solo Charizard taking his spot.
Roster:
Mario
Donkey Kong
Link
Samus
Yoshi
Kirby
Fox
Pikachu
Luigi
Jigglypuff
Captain Falcon
Ness
Bowser
Peach
Zelda
Sheik
Dr. Mario
Falco
Marth
Ganondorf
Mr. Game & Watch
Meta Knight
Pit
Zero Suit Samus
Wario
Ike
Charizard
Diddy Kong
King Dedede
Olimar (with an Alph alternate)
Lucario
ROB
Toon Link
Sonic
Villager
Wii Fit Trainer
Rosalina & Luma
Little Mac
Greninja
Palutena
Robin
Shulk
Lucina
Dark Pit
Bowser Jr. (with Koopaling alts)
Duck Hunt
Mega Man
Pac-Man
Mii Fighter (Mii Brawler, Mii Swordsman, Mii Gunner)
DLC:
Mewtwo
Lucas
(Other DLC fighters currently unknown)
Stages.
Both versions
Battlefield
Boxing Ring
Final Destination
Gaur Plain
Wily Castle
3DS version
3D Land
rena Ferox
Balloon Fight
Dream Land
Find Mii
Gerudo Valley
Golden Plains
Living Room
Magicant
Mute City
Pac-Maze
Paper Mario
PictoChat 2
Prism Tower
Rainbow Road
Reset Bomb Forest
Spirit Train
Tomodachi Life
Tortimer Island
Unova Pokémon League
Familiar stages on 3DS
Brinstar
Corneria
Jungle Japes
Distant Planet
Flat Zone 2
Green Hill Zone
Mushroomy Kingdom
WarioWare, Inc.
Yoshi's Island
Wii U Version:
Big Battlefield
Coliseum
Duck Hunt
Flat Zone X
Gamer
Garden of Hope
Jungle Hijinxs
Kalos Pokémon League
Mario Circuit
Mario Galaxy
Mushroom Kingdom U
Orbital Gate Assault
Pac-Land
Palutena's Temple
Pilotwings
Pyrosphere
Skyloft
The Great Cave Offensive
ATown and City
Wii Fit Studio
Windy Hill Zone
Woolly World
Wrecking Crew
Wuhu Island
Familiar Stages
Kongo Jungle 64
Onett
Temple
Yoshi's Island
75 m
Bridge of Eldin
Castle Siege
Delfino Plaza
Halberd
Luigi's Mansion
Lylat Cruise
Mario Circuit (Brawl)
Norfair
Pokémon Stadium 2
Port Town Aero Dive
Skyworld
Smashville
DLC Stages
Miiverse (Unknown if only for Wii U or both versions)
Assist Trophies
Andross
Ashley
Chain Chomp
Color TV-Game 15
Dark Samus
Devil
Dillon
Dr. Kawashima
Dr. Wright
Elec Man
Ghirahim
Pac-Man Ghosts
Hammer Bro.
Advance Wars Infantry
Isabelle
Jeff
Kat & Ana
Knuckle Joe
Lakitu
Lyn
Magnus
Metroid
Midna
Mother Brain
Nightmare
Nintendog
Phosphora
Riki
Prince of Sable
Saki Amamiya
Samurai Goroh
Shadow The Hedgehog
Starfy
Starman
Skull Kid
Takamaru
Tingle
Waluigi
Pokeballs
Meowth
Electrode
Goldeen
Staryu
Eevee
Snorlax
Moltres
Mew
Togepi
Bellossom
Entei -
Suicune
Lugia
Gardevoir
Metagross
Latias & Latios
Kyogre
Deoxys
Abomasnow
Palkia
Giratina
Darkrai
Arceus
Victini
Snivy
Oshawott
Zoroark
Kyurem
Keldeo
Meloetta
Genesect
Chespin
Fennekin
Fletchling
Gogoat
Swirlix
Inkay
Dedenne
Xerneas
Also, there is the online elements. "For Fun" (All Items, All Stages except Final Destination) and "For Glory" (No items, Final Destination-only. With nearly every stage getting a Final Destination variant to spice things up.)
Edit: If you're still reading this, feel free to add me on miiverse. Username: Kevinroc