January 2022 if you went with the Max 400 mile pack as well, regardless of when you preordered - kinda sucks but will be worth the extra wait in range. Let the first deliveries work out the bugs/issues too.
But back to your original post and comparison pics. I think you might be right; those small little areas in front of gear tunnel may be required to house/lock in additional battery cells under the seat - makes total sense. If that is all that is lost it will be great as that is about all that...