Similar to their earlier Game of the Year edition of The Elder Scrolls IV: Oblivion, Bethesda have announced that a version of Fallout 3 that includes all of the DLC released so far in the price of admission. Undoubtedly this will be the definitive version, just as it was with the Oblivion GotY version.
The game will release on October 13 and will cost $60 for the console versions and $50 for the PC version. Bethesda have also announced that the DLC for PS3 is coming very soon. Broken Steel is coming on the 24th of September, followed by Operation: Anchorage and The Pitt on 1st October, and then Point Lookout and Mothership Zeta on the 8th. Good news all round, then.