Up to 20 more hours of gameplay!
If you're a big fan of Skyrim, you'll be happy to hear that some geeks got hands-on with the coming download pack called Dawnguard. This download expansion pack is said to add anywhere from 10 to 20 hours of additional game play depending on how you play it. The game has two different tracks with one for Vampire Lord and one for Dawnguard.
Apparently, the two tracks cross at some points and then diverge again. The Vampire Lord track has the player helping a female vampire find her mother in an area of Oblivion called Soul Cairn. This area is in a previously unreachable part of the map from the main game and adds in a huge landmass with multiple castles and fortresses to play.