Going along with the DLC trend, Bethesda announced today that Fallout: New Vegas DLC is already in the works. The additional content won't be ready until the holiday season, at which point it'll be released as an Xbox LIVE exclusive.
If Fallout 3's collection of add-ons is any indication, the New Vegas DLC should be well worth whatever price tag Microsoft and Bethesda agree upon. No exact date or other such details have been revealed yet.
Fallout: New Vegas launches tomorrow, across North America.