I'd love to go to Akavir and I think there's a huge amount of potential there. It's supposed to be at least the same size as Tamriel, with several distinct cultures and races (some very different to Tamriel). If we ever do go there I hope they do it justice - give us bits of it across several different chapters and DLCs rather than condensing it down or retconning it to be tiny so they can cram it all into one and then say it's done.
But I'm expecting we'll see more of Tamriel before we go anywhere else on Nirn. I think Hammerfell is likely given it's a big empty space on the map and there's been complaints from some players about a lack of DC chapters. (I doubt that's how ZOS are thinking of it, but they may react to the feedback anyway.) Add on the fact that we haven't had a release in Hammerfell since Craglorn and I think it's a prime candidate.
what other kind of regions do we have in Hammerfell? tbf the last dlc they got was thieves guild which as a loooong while ago
I suspect they're holding a chunk of Hammerfell for when we get ES6 to market them in the same year