Captain K Mart - doesnt afraid of anything
I think that there is one more major DLC in store for Skyrim and it will deal on a large scale with the second Great War, and on a small scale the fact that the Dragonborn now belongs to Hermaeus Mora like Miraak before him.
My reasoning for the second Great War being the setting is that they invested too much into the tension between the Empire and the Aldmeri Dominion to just leave something like a war on a massive scale to just be mentioned in a book in the next Elder Scrolls game. Also, after defeating Miraak, I went back to the Skaal village and the new shaman (Frea?) warned me to beware of Hermaeus Mora's wishes, and remember the path I was given.