In the background of these pictures on Twitter shot from the Wizarding World of Harry Potter area, you can see a massive attraction building rising up over the trees that is part of the new Super Nintendo World land under construction at Universal Studios Japan. While it is quite visible right now, I would think that they’ll add some kind of themeing to the exterior on this side to make it blend in better with the Wizarding World.

https://twitter.com/LCASTUDIOS_USJ