PS4, PS3, Xbox One, Xbox 360, Wii U, PC, iOS.
Disney Infinity 2 was confirmed this week as a Marvel joint, featuring Iron Man, Thor, Captain America, Hulk, Black Widow, and Hawkeye. In the hype though some of the platforms weren't confirmed, but we now have solid info from Disney -- PS3, PS4, Xbox One, Xbox 360, Wii U, PC, and iOS.
If you noticed the omission of the Wii there, that's because it's not going to be released for Nintendo's previous console. It's an interesting mix of current and last-gen, and I'm curious to see how the game looks overall. Still, the omission of the Wii will probably sting for a lot of younger gamers out there.