According to GameSpot, the two upcoming pieces of Fallout 3 downloadable content will each be delayed by one month. The Pitt, previously scheduled to come out in February has been pushed back to March. Broken Steel, which was slated to come out in March and will continue the main story and lift the level cap, is now due out in April. This was confirmed to GameSpot by Pete Hines, VP of Marketing for Bethesda.
The Pitt and Broken Steel are exclusive to Xbox 360 and Windows PC. The PlayStation 3 version of Fallout 3 will not receive the downloads.