>>45597179realistically speaking I can't see Game Freak giving enough of a shit to want to put much thought into reimagining Sinnoh's map, but at the same time they'll want to squeeze as much juice out of the Gen 8 marketing quirks and mechanics as possible.
I could easily see the overworld sections of the game more heavily resembling Lets Go so they can keep their birds-eye view blocks and grids, while the battles themselves run in the SS battle style, complete with new Gigantimaxes and so on. That is, /if/ Sinnoh gets remade this generation at all. It's not like they've got much of a pattern going on with second games and remakes, they're pretty much just doing whatever the fuck they feel like.
