I cannot see it be near as big as Genshin Impact as much as that'd be cool.If it's similar to Genshin Impact's size then I would be satisfied, but it'll probably be a fraction of that.
I think they could keep it a surprise until we play the game ourselves, but betting they may reveal more before release.I want to know more about the story itself and what's really the endgame for this. It's interesting how we've gotten the setup for why we're catching Pokémon for the Pokédex, but now about what's causing the Pokémon to get angry and rage at us and what bigger plot is unfolding.