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Bethesda just released a new screenshot on twitter for an upcoming announcement that will be revealed tomorrow, but many of the media sites are jumping at the idea that this is indeed a screenshot from the new Skyrim DLC (rumored to be called Dawnguard). One thing many will notice however is the obvious graphical advancement in this screen over the actual Skyrim graphics, leaving this as an unconfirmed guessing game. Though it could also be pre-rendered for a trailer, but only time will tell.. but speculations are that the man in the image is a Nord prisoner of the Thalmor.
Bethesda did say during the announcement of Kinect for Skyrim that they are "hard at work" on the first expansion pack DLC for Skyrim which as a reminder will be exclusive to the Xbox 360 for the first 30 days, so we'll see what happens tomorrow.
Source,
CVG.com