Bethesda has announced that the fourth Fallout 3 expansion, Point Lookout, will be available on June 23. They've also released three new screenshots and a trailer.
Point Lookout includes a quest line set in the town bearing the same name, and will feature new perks and Achievements, much like the previous add-ons. The final add-on, entitled Mothership Zeta, is expected in July.
This Point Lookout release is for Windows and Xbox 360 only, the PlayStation 3 version will be released at a later date.
You can download the video from GP Downloads (55MB)