Super Smash Bros. for Nintendo 3DS / Wii U

Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U are both versions of the upcoming fourth installment of the Super Smash Bros. series being developed by Sora Ltd. and Namco Bandai Games. Each version has a different release date due to the time that it will take to finish each one.

Gameplay
It has been confirmed that the Final Smash and Footstool Jumping features are returning from Super Smash Bros. Brawl, while the "tripping" mechanism has been removed and the game's Adventure Mode will be significantly different than the Subspace Emissary. It has also been stated that players will be able to send customized fighters from one version to the other, that attack directions will be customizable , and that the pace of battles will be in between Super Smash Bros. Melee and Super Smash Bros. Brawl. The game will not make use of the touch screen controls that both systems support during gameplay.

Smash Run
A new mode, Smash Run, has been confirmed to be a Nintendo 3DS-exclusive mode, strongly resembling the City Trial mode from Kirby Air Ride while including elements of the Subspace Emissary mode from Super Smash Bros. Brawl. In this mode, players travel in a large maze-like map, fighting enemies from both Nintendo games and from Super Smash Bros. games, such as Magikoopas, Chandelures, Goombas, Shy Guys, and Kremlings. While fighting, players can collect several items similar to patches. These patches can increase attack power, special attack power, jumping, and movement speed. After five minutes, players are shown the stats of their attacks, courtesy of the patches they collected, and they are pitted in several modes, similar to the Stadiums from City Trial. The players then must fulfill certain conditions to win the game.

Playable characters
Due to limitations with the Nintendo 3DS version of the game, certain characters from the previous installments in the series might be cut from the rosters of both versions in order to keep them consistent. So far, 29 characters have been confirmed, consisting of 23 veterans and 6 newcomers.

Character movesets

 * F.L.U.D.D. (Mario attack)
 * Toad (Peach attack)
 * Luma (Rosalina attack)
 * Pikmin (Olimar attack)
 * Rush (Mega Man attack)
 * Lloid (Villager attack)
 * Navi (Link taunt)

Stage cameos

 * Shy Guys in Karts (Rainbow Road stage)
 * Lubba (Mario Galaxy stage)
 * Lumas (Mario Galaxy stage)
 * Kotake and Koume (Gerudo Valley stage)
 * Alfonzo (Spirit Train stage)
 * Loftwings (Skyloft stage)
 * Viridi (Kid Icarus: Uprising stage)
 * Nintendog (Beagle) (Nintendogs stage)
 * Kapp'n (Tortimer Island stage)
 * Tortimer (Tortimer Island stage)
 * Leila (Tortimer Island stage)
 * Dr. Shrunk (Animal Crossing: City Folk stage)
 * Gracie (Animal Crossing: City Folk stage)
 * Crazy Redd (Animal Crossing: City Folk stage)
 * Lloid (Animal Crossing: City Folk stage)
 * Frillard (Animal Crossing: City Folk stage)
 * Labelle (Animal Crossing: City Folk stage)
 * Saharah (Animal Crossing village stage)
 * Wendell (Animal Crossing village stage)
 * Pelly (Animal Crossing village stage)
 * Mabel (Animal Crossing village stage)
 * Timmy and/or Tommy Nook (Animal Crossing village stage)
 * Yellow Devil (Dr. Wily's Castle stage)

Unspecified characters

 * Phantom
 * Dark Emperor

Stages
According to Masahiro Sakurai, both versions of the game will feature different stages. The Wii U version will mostly feature stages based on games released on home consoles, while the 3DS version will mostly feature stages based on games released on handheld systems. In the Nintendo 3DS version, each stage has only two tracks that can play, whereas the Nintendo Wii U version will have a comprehensive list similar to My Music from Super Smash Bros. Brawl.

New items

 * X Bomb
 * A bomb resembling the Hocotate Ship
 * Steel Diver, a projectile weapon based on a Steel Diver submarine
 * Beetle
 * Bottled Fairy
 * Ore Club
 * Cucco
 * Gust Bellows

Returning items

 * Capsule
 * Smash Ball
 * Ray Gun
 * Assist Trophy
 * Green Shell
 * Fire Flower
 * Poké Ball
 * Trophy
 * Home-Run Bat
 * Banana Peel
 * Bumper
 * Motion-Sensor Bomb
 * Crate
 * Rolling Crate

Assist Trophies

 * Skull Kid (New)
 * Nintendog (French Bulldog)
 * Starfy
 * Ashley (New)
 * Mother Brain (New)
 * Waluigi
 * Andross
 * Isabelle (New)
 * Metroid
 * Devil
 * Knuckle Joe
 * Saki Amamiya
 * Lyn
 * Dr. Wright
 * Midna (New)
 * Dark Samus (New)
 * Chain Chomp (New)
 * Elec Man (New)
 * Color TV-Game 15 (New)

Nintendo 3DS

 * Saria

Wii U

 * Little Mac (as he appears in Captain Rainbow)
 * Phosphora

Pokémon

 * Palkia
 * Dedenne
 * Xerneas
 * Arceus
 * Meowth
 * Electrode
 * Eevee
 * Staryu
 * Metagross
 * Fennekin
 * Meloetta
 * Gogoat
 * Entei
 * Deoxys
 * Kyurem
 * Victini
 * Keldeo