The Bethesda Blog now offers up a an official trailer for The Elder Scrolls V Skyrim: Dawnguard the recently teased project that turns out to be the first DLC for Bethesda's RPG sequel. There's no news yet on a Windows edition, as word is: "Watch the official trailer for Dawnguard, the first game add-on for Skyrim. Dawnguard will be available for download for 1600 Microsoft Points on Xbox LIVE this summer."