According to the latest issue of Nintendo Power, there is no plans for a Wii U verison of Epic Mickey 2.
Warren Spector of Junction Point stated when asked about the Wii U version of the game:
“We’ve certainly thought about it. It’s a really interesting piece of hardware. Unfortunately, we were already too far into development by the time it was announced. So there’s just no way we could get it out by the time Wii U launches. I mean, who knows what’s going to happen in the future? But for right now, there are no plans. There is all sorts of fun stuff we could do with that controller, though.”