For the first few seconds up until after you see the spinny Fletchling thing on the roof, I thought this was Pokémon Z. I'd be down with seeing some Kalos connections in this region.
For the football stadium, I was thinking that has something to do with the side project in this game (like contests, etc). Or it might be one of the gyms, I can see that being a gimmick. But the uniform you're wearing makes me think there's more to it.
I love the starters. Still happily going with my tradition of choosing Grass first, Grookey seems like a cool pokémon and I'm itching to try the other two at some point, particularly Scorbunny. It could lend itself well to Fire/Fighting, but I'd prefer something else like Fairy. I hope one or more of them has a surprising type combo like how Decidueye randomly evolved into a Ghost. I can see Grookey becoming a Grass/Dark to maintain the mischief theme; we haven't had one since Gen 3 I think.
The region looks great, the cities have an awesome aesthetic and I love how there's a lot of countryside to explore. End of the year can't come soon enough.