The park is adding Jurassic and BttF without cloning anything, so what's stopping them from adding Harry Potter rides that are new? A Chamber of Secrets ride, a Quidditch coaster, a hippogriff flying theatre... there are so many different things you can do while still keeping Hogwarts castle as the weenie.
I'd be very surprised, in the event we get Potter, to see yet another clone of Forbidden Journey.