I honestly think something is going to happen to Garlemald before we go there, as SE has mentioned not liking to make Garlean areas, and doesnt think players would enjoy vising a set of fully teched out zones.
I expect it to be blown up or something, and we spend the expansion exploring ruins, this way its easier for SE to make the zones, by just placing random pieces of broken tech all over the place of a desert. (I would be massively disappointed, but its what I expect at this point.)