Right now I'll take anything! haha!! But I hear ya on the Cyrodill/Morrowind thang. Would like some new regions for sure. Black Marsh sounds badass. Dammit anything would! I'm not picky. For some reason, I have a strong feeling the Thalmor will be involved, hook or by crook.
They would obviously save those provinces for other games. The only thing that they could do would be part of the Morrowind mainland, since we've already had a game in Morrowind, but only on Vvardenfell.
I thought they handled previous expansions pretty well, adding maybe and island or something similar, some smaller content packs etc.