Hell Garlemald should've and could've been it's own expansion and I wouldn't have been mad.
It has been hinted at, we DO NOT have any kind of real details, but it IS possible we may be going back to rebuild a la the Firmament. Again, I have zero to show other than a strong feeling that the devs have a few ideas..we will just need to wait.

Its a hunch, a guess..nothing more.