A source close to Disney has revealed details concerning Warren Spector's Epic Mickey, to Eurogamer.
The reason Wii was chosen, according to the source, is due to Mickey's tools: paintbrushes, erasers, thinner, pencils and artist tools. These tools are mapped to Wii remote gestures.
According to the source, the game is also about exploration, thinking and artwork, where you must use your environment to overcome puzzles.
Mickey will also be getting "his first makeover in years" which is why "no one's seen his face yet, but he's far more retro than you've seen him for years."
There's more through the link along with a bit of background story.