Fallout 3 Broken Steel DLC to Change Ending

In a tidbit from an upcoming interview with UGO, Fallout 3 DLC lead producer Jeff Gardiner reveals Bethesda will change the game's ending with the third DLC.
“In our third DLC, “Broken Steel,” we’ve come up with a way of allowing the player to continue on past the game ending… by changing it! You will not have to load in a new game to play any of the DLC material â€( though you will have to finish the main quest to experience most of what “Broken Steel” has to offer.”