Want a chance to play Dawnguard early? Bethesda has had such a success with the PC beta updates, that they are making one for the Xbox 360 - and it is not just a beta update, it is the beta for Dawnguard!
to apply. The process only takes a couple of minutes. You'll also need an account on the official forums
They'll select the testers in about a week. "Players accepted into the beta will receive an Xbox LIVE code to redeem Dawnguard. The beta is the full version (complete with Xbox LIVE achievements) and those participating will not have to purchase the content."