The Fallout community Duck and Cover managed to get their hands on a leaked trailer from what's apparently the next downloadable chapter for Fallout: New Vegas - Honest Hearts. Before they had to take the trailer down they managed to grab some screens, one of which you can take a look at below.
Bethesda applied for trademarks on Honest Hearts, Old World Blue and Lonesome Road back in January, which adds some credibility to Duck and Cover's claims. Expect more information this week as Bethesda are holding a major press event.