Super Smash Bros. for Nintendo 3DS / Wii U

Super Smash Bros. for Nintendo 3DS / Wii U, known as Dairantō Smash Brothers for Nintendo 3DS / Wii U (大乱闘スマッシュブラザーズ for Nintendo 3DS / Wii U) in Japan, are two video games announced for the Wii U and Nintendo 3DS during E3 2013. They both act as the fourth entry in the Super Smash Bros. series of fighting games, which features several Nintendo characters.

Development
The game was first announced at E3 2011, but no further information was released due to Masahiro Sakurai working on finishing Kid Icarus: Uprising. At the start of 2012, the game was officially in production, but new information was not released until the following year. On June 11, 2013, two trailers were shown during a Nintendo Direct: one announcing the game and the Villager from Animal Crossing as a newcomer, and another announcing that Mega Man would also be a playable character. One more trailer was released before the end of E3 2013 showing that Wii Fit Trainer would be playable for the first time. Afterwards, the game's official site started revealing at least one playable character per month.

Mega Man
The original Mega Man appears as a playable character. Other Mega Man related appearances in the game include Rush (who uses Rush Coil), as well as Mega Man wielding several Special Weapons. The Wily Castle from Mega Man 2 appears as a stage, and the Yellow Devil appears on it as a stage hazard. Elec Man appears as an Assist Trophy character, and the Met as an enemy.

Mega Man's moves
Mega Man's confirmed moves:
 * Neutral ground/air attack: Mega Buster
 * Strong down attack: Sliding
 * Dash attack: Top Spin
 * Strong up attack: Mega Upper
 * Side smash attack: Charge Shot
 * Up smash attack: Spark Shock
 * Down smash attack: Flame Blast
 * Front air attack: Flame Sword
 * back air attack: Slash Claw
 * Up air attack: Air Shooter
 * Down air attack: Hard Knuckle
 * Grab: Super Arm
 * Neutral special attack: Metal Blade
 * Side special attack: Crash Bomber
 * Down special attack: Leaf Shield
 * Up special attack: Rush Coil

Additionally, Mega Man's Final Smash summons MegaMan.EXE, Mega Man X, Mega Man Volnutt, and Star Force series Mega Man alongside him before firing off a powerful Shining Laser-like beam from each simultaneously, much like the Pokémon Trainer's Triple Finish Final Smash in Super Smash Bros. Brawl.

Playable characters
Confirmed characters so far:

Assist Trophies
Assist Trophies are items that, when picked up, will break and summon the character that was in the Trophy.

Elec Man has been announced as an Assist Trophy.

Trivia

 * The silhouettes of the Robot Masters in the trailer introducing Mega Man are from their original official artwork.
 * Some text differs between the Japanese and English versions of the trailer to reflect localization differences, such as Clash Man/Clash Bomb becoming Crash Man/Crash Bomber, and Guts Man's serial number DRN 004 becoming DLN 004.
 * It has been noted that when Mega Man uses attacks that require both arms, he vents them afterwards. This is a nod to Super Adventure Rockman where he uses both Mega Busters to finish off Ra Moon while being warned by Dr. Wily that he could overheat himself while doing so.
 * Before Super Smash Bros. Mega Man appeared on the German Club Nintendo comics Super Mario: Die Bescherung and Super Mario: Die Verwandlung.
 * Following the Archie Comics' storyline Worlds Collide, this game will mark the first encounter of Mega Man and Sonic the Hedgehog in a video game.
 * In addition, this marks the first time that Mega Man encounters Donkey Kong, Link, Zelda and Pit in a video game since they appeared in Captain N: The Game Master.
 * Incidentally, this will feature the first encounter between Mega Man and Samus Aran who have both appeared in Captain N, though the former appeared only in the cartoon, while the later was only in the comic.
 * The above artwork done by Ryuji Higurashi was done in the same style that was used from the original Mega Man series Japanese box arts, with eight characters representing stage bosses and Bowser the main villain.