Honestly though, part of me would actually wonder if they have looked at how the Tribute Store has been consistently executed with a level of care and respect, to where if they are doing a Preview Center..that they can actually make it a "Specialty" store, with select merchandise from the IP's established with the projects that they'd show, and to also preview things that relate to what's there.
So say, you have a section dedicated to Universal Monsters, and you could deck it out in theming in a similar scale to that of the Stranger Things portion of the Tribute Store from 29, and sell merchandise relating towards the Monsters (whether it'd be that of the rebranded merch that's been rolled out for the past year or that of the collab artwork they did in Hollywood with Tristan Eaton). Same applies for Super Nintendo World with merch that'd appear in the Osaka land.
It could be a very unique way to capitalize on hyping up the new park, while also reusing items that you have in stock. It's a thought, but I've been thinking more and more if that's a potential path they could go down.
EDIT: In a sense, it'd be almost similar to Epcot's preview center they have at the moment, but on a grander scale.