News: On the game's release date no less.

Bethesda Softworks' Fallout: New Vegas is now available in stores for the PC, PlayStation 3 and Xbox 360. But the publisher isn't wasting any time and has announced that the game's first downloadable expansion will be available exclusively on the Xbox Live Marketplace before the end of the year.
This announcement follows on the heels of a similar release schedule for the DLC to Fallout 3. All of the game's five expansions were released on Xbox Live (and made available to PC players) before they were eventually ported to the PlayStation 3. There's no word yet if a similar release schedule will be used for the New Vegas DLC.
This will be the first of several expansions for the Obsidian-developed New Vegas, which Bethesda will announce "in the coming weeks."
УWe're excited to continue the partnership between Bethesda and Microsoft, and build on the success of the game add-ons released for Fallout 3 on Xbox Live,Ф said Pete Hines, VP of Marketing and PR of Bethesda Softworks. УFans will once again be able to continue their experience in the Fallout universe with the add-on packs planned for after the launch of the game.Ф
We'll have more soon.