Images that may or may not be authentic at All Games Beta suggest that a re-issue of Sega's Castle of Illusion starring Mickey Mouse could be on the cards. The game that was one of several well received Sega developed Disney titles on Mega Drive, has found itself in the same position as Duck Tales with the rights being split between Sega and Disney.
We really don't have any other information, so it remains to be seen is this is for real or just wishful thinking...