I think we can probably use it as a gauge for what will be brought to Hollywood as well. By that I mean, If they bring not only Hogsmead Village but also the Diagon Alley portion to Japan in the first Phase, there may be a good chance they will do the same here as well.
The LA Times says that the plans for Japan will be announced tomorrow (Thursday), so we shall see
Harry Potter heads to Universal Studios Japan - latimes.com
EDIT: So the article says USJ's HP will be around $500 Million, thats interesting because the IOA HP only cost $200 million. Something big is going in over there. London is sounding more and more likely.