Bethesda has been way too busy fixing all of the glitches that keep popping up in their mega-monster hit, Skyrim. And then they have to fix the glitches that their fixes caused. They've been quite busy, too busy to even discuss a DLC posibility for Skyrim.
Or have they?
ZeniMax Media, Bethesda's parent company, filed a trademark in February for the word "Dawnguard" as it relates to video game software, which includes downloadable content. The trademark does not specify anything else. Speculation is bouncing around because of Skyrim's Mythic Dawn cult and Redguard race.
Do the assumptions add up for you or is this too close to reaching for straws for your taste?