I could see Thavnair being the first zone as our entry into Ilsabard. With the moon as the last zone and Garlemald presumably the one right before it, I'd wager that the remaining three zones will be us climbing north from Thavnair to Garlemald.
Maybe we'll see Corvos.

Sharlayan doesn't seem to fit here which is surprising because I really thought they were leaning heavily into it in recent patches.