The legendary Warren Spector has at long last confirmed the rumour from EGM of him working with Disney, along with Pixar:
Since then, my game (about which we will say nothing) has made amazing progress. My team and I have been working hard on our own and (get ready for the cool factor to go way up) in collaboration with folks from Disney Feature Animation and Pixar. If I say anymore, I'll get in trouble, so let's just leave it at that.
So could this indeed be the Mickey Mouse platform game that EGM believed would be a Mario-killer?