Skyrim lead artist, Mark Carofano has told GameFront at the recent E3 that the Dawnguard expansion “will be significantly bigger than any Fallout DLC” but won’t be “as big as Shivering Isles” for Oblivion.
Carofano also said that “It’ll take between 10 and 20 hours to beat,”. “It’s about as long as a faction line.” he continued.
The expansion will feature vampires – which your character will turn into regardless – and the opposing faction, the Dawnguards that are hunting them. It will be released on June 26, 2012 for the Xbox 360 and will pass on to the PlayStation 3 and PC after at least 30 days of platform exclusivity.