According to an anonymous "tipster" (i.e. someone who lucked into an online survey and doesn't know the meaning of NDA), Destructoid has images of potential artwork for a sequel to Disney's Epic Mickey. They're also testing out a variety of names, most of them revolving around the concept of two, as this game would introduce co-op with one player taking the role of Mickey's "brother" Oswald the rabbit.
Epic Mickey wasn't the industry-shifting behemoth that one might expect from the pre-release hype, but I bet it sold better than you thought it did. There's no word on potential systems these might show up on, however the box shapes seem to imply they're not talking about handhelds. I wouldn't be shocked if they move the series off the Wii to the HD systems, or possibly the Wii U to try and keep their stable of Nintendo fans. Official game announcements aren't terribly common between now and the end of winter, so we may have to wait a while to get anything official about the game, unless this leak forces them into the open.
Looks like Epic Mickey 2 may be in development [Destructoid]