I could see Italy being the next region, honestly.
Really I think they have a pool of obvious options they're probably mulling over:
For what it's worth, just because a region is obviously based on a real world location they don't necessarily have to draw attention to it. That only really started being a thing with Gen VI, from what I remember anyway. Then they can plausibly pull away from controversies. It's not like Galar referenced them leaving the PokéEU.
- Italy
- South Korea
- Germany + Denmark
- China
- Spain
- Brazil
- California + Texas + Mexico (they'd basically pull a RDR)
- Australia + New Zealand as a DLC island
- Greece + Egypt (they'd fudge it a bit)
- Okinawa Prefecture (probably the most unlikely unless they go all-in with seafaring)
Man i'd love a large Texas based region. Ive been playing around making Fakemon for one for a while now and we have so many climates to play in and animals to draw from it would be great. ( Tho no big ice area)