this really isn't a spoiler and unless your really paying attention to the guy you ain't gonna hear it. But in one of the quests for the companions when your battling guys with the guy , after the fight he says " i've killed one of everything in skyrim , i think its time to goto morrow wind" .
Its not much but prehaps it suggests that either some DLC or the next game might have something to do with Morrow Wind.
I'd rather see the DLC for Skyrim , which would cost 30 bucks a pop to include larger land masses like Cyodill and Morrow Wind.