The most notable thing about the episodes Kodaira has worked on is how character focused they are. In particular, there's an emphasis on relationships and how that ties into character growth. So perhaps this new season will have a sharper focus on the relationships in the cast and between their Pokemon. I think it'd be refreshing for Ash to have a close male friend who isn't a rival, as opposed to yet another PokeGirl.
Gou's goal will be tricky because there's a risk of prioritising quantity over quality. Catching more Pokemon tends to lead to less individual focus on each one, so some of them can come off as expendable. This could be why the show has been reluctant till now to have a character whose goal is to catch them all, despite how fundamental it is to the Pokemon experience. It usually wants to have each Pokemon to have its own character and be on screen a lot, but they wouldn't be able to do that if they're in a PC somewhere.
Besides that, it's the perfect goal to have in a show spanning all regions. Gou will have a built-in reason for wanting to travel to different places.
We'll have to see what Ash will be doing. Conveniently, there are eight regions, so they could easily come up with eight trinkets for him to collect to qualify for something.