I'm assuming you mean the FJ show building (not the queue)?
Higher capacity Ollivanders for sure. Japan's relocated Ollivanders suggests a higher capacity to correct the mistake made in Orlando, so I feel we'll have the same. However, don't expect any shops right next to Hogwarts. Doesn't stay true to the stories/films, and it just wouldn't make sense.
As for the empty space in between Hogwarts and Hogsmeade... All I can logically think of is a forested area. As I mentioned earlier, Alan Gilmore has stated that each Hogsmeade in the Universal Parks will have its own unique "flavor," which suggests that no lake will be coming to Hollywood since that feature's been claimed by Japan.