I would love them to do a version of the Alien Encounter experience that used to be at Magic Kingdom (a "theatre in the round" attraction). I heard it was quite extreme, thus Disney had to eventually remove it. I rode Stich's Great Escape and whilst this got a lot of flack as it was nowhere near the level of its predecessor, I could see (and hear lol) the potential. Maybe they could split the building in two, one half as the theatre, the other half as a walkthrough/Fright Nights maze.