I don't think we're going to get much in the way of details on Thursday with how short the presentation is going to be.
At most I'm guessing they'll tell us what the themed worlds will be but without any detail of what will be inside each world.
But it could be even less than that.
Despite all of the leaked info we've been hearing from insider sites and blogs, this is Universals first official public announcement for the new park. So we might just get a "We're building a new park! It will feature Nintendo World and some other great worlds. We look to open it in 202X and will continue to give more details in the future!"