Among other things, Super Smash Bros. for Wii U and 3DS will be getting a major patch in mid April, according to today’s Nintendo Direct. The patch will include a bunch of new costumes for Mii Fighters, including game-themed ones such as those of X and Protoman from Mega Man, characters from Xenoblade Chronicles, Zelda, and more. The Mii Fighters will also be getting a Miiverse stage, and both versions of the game will be getting a collection of sharing features. They did not detail the balance patches in the Direct.
Source: Nintendo Direct