>>33727172You can see blockades on the sides in OP's pic, the signs point to places that you can't explore, which is basically Alola as a whole.
The other pic that's rumored to be Kartana's ultra space is also the same boring corridor + circle layout.
I don't see anything to prove these games will in any way fix SM's lack of any sizable dungeons or areas at all, which is a huge problem with Alola.