We've got a trailer for the first full Skyrim expansion, Dawnguard. Looks like we'll have the choice to either join or fight a group of vampires bent on using the Elder Scrolls to blot out the sun.
Unfortunately it's a timed exclusive for the XBox 360, which means PS3 and PC players will have to wait a bit to play the expansion themselves.
If you look closely you can also spot a few new features like crossbows and apparently the ability to turn into some kind of vampire monster. There's also a really cool shot of a dragon plunging through ice into the lake below.
Check it out!