Idk I feel like the story itself is already ended, so I see no future with that, despite I would have loved that. However, I'd expect more paradox pokemon as they're not a lot. Now, this actually opens up to the possibility of the reprehension of the story. I'd be disappointed if they just added more paradoxes in Area 0, so the workaround could be introducing another Area 0 maybe in a remote Island or something. I kinda agree with whom mentioned that one of the expansions will be an Island, in fact SV kinda lacked water exploration. Same was with SWSH and they added Armor Island, so yeah it can be something similar.
However, going back to another Area 0, I'd be pretty disappointed as well, because the biggest fashion of that place was that it was a secure and sacred garden where nobody was meant to get in. Seeing a similar place means that Area 0 looses big part of its uniqueness.
I think that DLC will mainly be centred on Legendary pokemon and how they can be introduced in gen 9, exactly like they did in SWSH.
And yeah, I think it's gonna be 2 expansions, like the older DLC.