A world for the Hunchback of Notre Dame of course. I'm expecting Hallow Bastion to Return. I also want Beast to come back in some way. I didn't mind the Pirate's world and wouldn't mind it returning. I think we're through with Atlantica and Olympus will probably come back as the world with the battle arena again.

making it a musical level like Atlantica
No.

Marry Poppins to appear as a boss or summon, preferably both. If I had to choose...boss.

Tron was pretty cool and they might go with it given the new movie. Let's get a Pixar movie in their too. The only one that I like the idea of for this game would be the Toy Stories.