User blog comment:Jimeee/Bethesda tweets mysterious teaser picture.../@comment-4975504-20121104034322

Now that I compare it to the Dawnguard image, it seems like both share the same shoulder build and the way they stand. Also you can make out the line of the hairs on the side of the mask. I myself am 90% sure this is the Generic Dragonborn in whatever kind of armor.