The game will be released as two separate editions; one for Wii U and one for 3DS. Each version appeared to have its own unique art style, in a trailer that was shown during Nintendo's E3 direct conference.
We'll post the clip here as soon as we can. It showed classic characters including Mario, Bowser, Pikachu, Kirby, Donkey Kong and the Animal Crossing villager throwing down. Mega Man was also announced, as a new competitor in the series.