I feel like if the new park consists of, say, Lord of the Rings, Legend of Zelda, How to Train Your Dragon, Kung Fu Panda, and Fantastic Beasts, I think you could get decent cohesion out of that. All consist of beautiful, detailed environments that take place in "fantasy" environments from the past. One could argue Shrek fits in there as well. However, if Star Trek is also supposed to be in Park 3, I have no idea how that'd fit in with the rest.