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 may have different release dates 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 similar to Super Smash Bros. Melee. The game will not make use of the touch screen controls that both systems support.

Playable characters
Due to certain limitations with the Nintendo 3DS version of the game, certain characters from the previous installments in the series might be cut from the roster to save space on the cartridge.

Others

 * Yellow Devil (Mega Man)
 * Xerneas (Pokémon X)

Stages
According to Masahiro Sakurai, both versions of the game will feature different stages. The Wii U version will feature stages based on games released on home consoles, while the 3DS version will feature stages based on games released on handheld systems.

Nintendo 3DS

 * A stage similar to Battlefield from Super Smash Bros. Brawl.
 * Gerudo Valley from The Legend of Zelda: Ocarina of Time and The Legend of Zelda: Ocarina of Time 3D.
 * The Spirit Train, from The Legend of Zelda: Spirit Tracks.
 * Arena Ferox, from Fire Emblem: Awakening.
 * A stage based on Super Mario 3D Land
 * A giant room with a Nintendog playing in the background.
 * A stage based on Chapter 11, "Viridi, Goddess of Nature" from Kid Icarus: Uprising.

Wii U

 * A stage similar to Battlefield from Super Smash Bros. Brawl.
 * Skyloft from The Legend of Zelda: Skyward Sword.
 * A wrestling arena-type stage.
 * The city from Animal Crossing: City Folk.
 * Dr. Wily's fortress from the Mega Man series.
 * A stage based on Wii Fit.
 * Garden of Hope from Pikmin 3.
 * A stage based on Pilotwings with Wuhu Island in the background.
 * Pyrosphere from Metroid: Other M.
 * Windy Hill Zone from Sonic Lost World.
 * A stage set in space.

Other

 * A stage that seems to be based on Donkey Kong Country Returns 3D.

Items

 * Capsule
 * Smash Ball
 * X Bomb