ShackNews writes Bethesda will release a free G.E.C.K. (Garden of Eden Creation Kit) mod toolset for the PC version of Fallout 3 in December. The game developer also unveiled three downloadable episodes for PC and Xbox 360 users will be released in early 2009. The price point of the downloadable content is unknown but here's some more info about what the episodes will offer:
Enter a military simulation and fight in one of the greatest battles of the Fallout universe - the liberation of Anchorage, Alaska from its Chinese Communist invaders. An action-packed battle scheduled for release in January.
Journey to the industrial raider town called The Pitt, located in the remains of Pittsburgh. Choose your side. Scheduled for release in February.
Join the ranks of the Brotherhood of Steel and rid the Capital Wasteland of the Enclave remnants once and for all. Continues the adventure past the main quest. Scheduled for release in March.