I've met a lot of players who would be highly interested in an Elders Scrolls game that would allow the player to learn more about the Dwemer and Snow Elves, let alone play as them. I think you should take this into consideration. I'd prefer it not to be in the format of an MMO or exclusive to one, rather one that you traditionally have donw for Morrowind, Oblivion, and Skyrim. Even go back in time could be an interesting concept for doing this next game.