The first and the newest DLC pack of Fallout: New Vegas, Dead Money, has now been released and is available for download on Xbox Live, and is priced at 800 Microsoft Points.
Here’s some info on the newest DLC pack:
“As the victim of a raw deal you must work alongside three other captured wastelanders to recover the legendary treasure of the Sierra Madre Casino. In Dead Money, your life hangs in the balance as you face new terrain, foes, and choices. It is up to you how you play your cards in the quest to survive.”