I was thinking for a very cool expansion pack, there could be an island off the coast of skyrim, maybe 1/3 the size...That would be inspired by the hills of Scotland. I mean the mist is perfect for deep green misty hills and castles are making their way into the game with dawnguard. Just a thought. It might be cool...especially if there is a war going on with the local tribes, and you come across a field with a 50 vs 50 battle going on. This would be a cool setting for battles in skyrim.
I would love that too. As for people saying that it would be frozen, it could always be warmed through volcanic and tectonic activity. This is fantasy, you can pretty much do anything you want. I just want a big new area to explore.