It seems like the revelation that Epic Mickey would be a Wii exclusive may have come too soon. Many have noted that while the Game Informer teaser page once claimed the game was "coming exclusively" for the Wii, all references to that exclusivity have been removed. Junction Point may be considering other options for the game, but we won't know for sure until the company gives official word.
As for what other consoles the game could come to, the PlayStation 3 seems like an apt pick. Its wand offers functionality similar to the Wii remote and it's due out before the game is set to hit. Natal is also a possibility, though it seems more based on full-body movement than pointer-like accuracy, so a game like Epic Mickey may not be ideal for it.