^Actually it's probably Socerer Mickey for ability reasons (He is the MOST powerful Disney character ever created). Normal Mickey doesn't have much in terms of abilities outside of cartoon powers, while sorcerer Mickey has magical abilities and can control the elements. But this doesn't mean we won't get other Fab Five characters (my money is on a Donald as part a 3 Caballeros pack and Goofy, who I would like to see as Super Goof)
I think at the comic-con demo video, one of the sky domes was a bunch of shooting and sweeping stars, just like Fantasia. You probably unlock that in Mickey's Toy Box adventure