I know Levicorpus may be already planned, but I might as well give an idea?
So you know how in Harry Potter and the Order of The Phoenix they practiced levicorpus in the Room of Requirement?
Perhaps when the server is updated to 1.9, it can be used to give people the "levitation" effect as seen in the movie
when they're levitating their fellow students to practice magic in the Room of Requirement