Last expansion idea I heard about was a Table Service, but maybe depending on the success of the sequel movies we’ll get a new ride eventually with a walkthrough in front of it?They should also expand Pandora. That walkthrough idea I heard was great.
That said, Pandora is probably the last thing that needs immediate help at the park. Dinoland & Rafikis take the cake on that, but the park as a whole needs a lot more. A new land as an expansion could help give the park 2-3 more rides along with a new E-ticket which would change guest touring habits away from going straight to Pandora.