the case with Fallout 3 add-ons, the first new content for New Vegas will be "exclusive" to Xbox Live when it's released this holiday. Though no plans to feature the same content on PSN (or PC, for that matter) have been announced, what happens to be exclusive to Xbox Live doesn't always stay exclusive to Xbox Live -- odds are New Vegas DLC will (eventually) be ported to PS3.
"We'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," said Bethesda mouthpiece Pete Hines in an announcement. "Fans 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."
Bethesda will reveal more details about New Vegas DLC in "the coming weeks."