The save files will carry over, you won’t have to restart if that’s your only concern.
[quote=“paralaje, post:3, topic:4980”] The way new content could be “in the middle” is by completing areas that are only half-done (like maybe there’s a cave that serves no purpose as of now or something similar) or by adding new events, pokemon, items, etc. to areas that are already in the game[/quote] Backtracking would depend on personal perspective I guess. It’d mostly be done for rockclimb(there’s a hidden grotto accessible only if you have rock climb in the crossroads currently), waterfall etc. And the stuff you already do for tesseract, but that’s already in the game. You may get similar stuff with other abilities that’d be implemented in 1.2 but nothing too different than what’s in the original games.
Edit: Since you can use fly or pikataxi, the amount of walking/cycling you’d do when backtracking shouldn’t be too much.