Disney Interactive Studios released another behind-the-scenes video for Epic Mickey. This one is pretty interesting, as Warren Spector talks about lesser-known characters from the Disney universe that he's bringing back for the game.
That said, there are a couple of really bold suggestions in this. Such as Spector thinking that this game might put Mickey Mouse on par with characters like Mario and Sonic. As mascot characters go, there's few more popular globally than Mickey but those are huge names to try and take on at this point. Best of luck, Warren.