The more I think about park number four, the more I hope we see Lord of the Rings, Back to the Future, and Star Trek included in the park...but I'm sure it'll be Illumination, Dreamworks, and Harry Potter related stuff instead.
Personally, I'd like to see Uni really take a serious crack at going non-IP for once in their parks...they initially attempted it at IOA, but even then only shoehorned in a small medieval/Greek mythology styled area in the Lost Continent. Big coasters, a stunt show, and a special effects walk through was ok...but with the big pockets Comcast has, i expect to see more stuff on the level of Tokyo Disneysea.