The first of undoubtedly many Fallout: New Vegas downloadable add-ons has been announced, and it’s will be available exclusively for the Xbox 360 for the time being. The DLC, titled Dead Money, will be available December 21st and will add new areas, enemies and choices according to the press release.
In Dead Money, you get screwed over in some sort of agreement, and have to recover the legendary treasure of the Sierra Madre Casino, which is a dangerous affair, apparently.
Not many specific narrative details are available outside of those few. December 21st is only about a month away though, so we won’t have to wait too long to learn more.