User blog comment:Jaykattz/Happy/@comment-4705438-20120511175014

I am 95% sure it is not going to add Cyrodill or Morrowind, those would be too huge to craft for a single DLC and there is plenty of stories to tell in Skyrim still.

Reminder, despite the fact that Bethesda promised bigger than average DLCs, whole province is just too much. A Daedric realm, perhaps, but that would most likely be an expansion material, not DLC.