My two main guesses are either a heretofore unmentioned region of the Exiled Lands, or just like…an island or something? Or maybe a region ringed by impassable mountains, something naturally hemmed in to keep players from leaving without copping out and using an invisible wall. I don’t know.
My own wish thread aside, mostly what I’m expecting from a new map is familiar assets, used in a new terrain in, hopefully, fun and interesting ways so it feels like its own thing. As much as I’d like to see a new map built entirely from the ground up with 100% unique assets, I highly doubt that’s even remotely feasible given the time frame and the other stuff they’ve got going on as well. There will probably be some unique elements, plant resources (even if they still give the same materials), enemies, feats and recipes, but I’d be very (pleasantly) surprised if it was anything more than that.
Which I mean, I’ve said before that I’ve played and mostly enjoyed all the Ark maps (I hated Extinction, yeah I said it), so I’d be perfectly fine with that. As long as I have a big new place to explore and build with plenty of nice scenery to look at, I’ll be happy as a clam.