Have you seen the concept art? It's basically a mis match of space ports from all the movies, and a little forest area similar to Endor. Personally, I think this was the wise way to go. The idea is that you are in a Outpost that is currently housing both the Falcon and the New Order's command ship. It works way better than having multiple mini planets, you can somehow teleport to by walking around the corner. It also allows them to introduce new aliens and other surprises that are exclusive to the park. You obviously cant' have a Hoth land in Florida or California.
Yes, I've seen the concept art. It's the Forbidden Journey method. Just throw everything into one land/ride. I'd have put a land or two in each park myself. Open one or two every year over the course of 5 or so years. With the new movies, they might even be able to do more than that. HP is showing that fans of these series will eat up whatever you give them. They will make multiple trips and throw money at whatever you give them. So give them multiple lands. Make them visit all of the parks. Figure out a way to replicate the success of HE and do inter-park transport. It's a freaking gold mine and they are limiting it to two rides in one park.
And if they can build Antartica at Sea World and have snow year round in Hogsmede, they can build Hoth.