A new interview at IGN sees Bethesda's Lead Producer Jeff Gardiner reveal the first solid details surrounding the upcoming Operation Anchorage DLC pack for Fallout 3. The company is prepping three DLC packs with Operation Anchorage apparently getting a release on PC and Xbox 360 early next year.
In Operation: Anchorage the player will find themselves able to re-live the famous liberation of Anchorage from Fallout lore -- inside a simulation similar to one found along the main quest of Fallout 3. Once the player finds their way into the simulation, they'll be stripped of their resources and have to survive within the rules set up by the simulation's creators.

The Chinese red army is everywhere, and the player will first have to secure the surrounding mountain side and then fight their way into the Chinese base. The player will have to use a lot of their standard combat skills, along with several new tools that will only be available in the downloadable content. These include interactive Strike Teams under the player's command and unique armor, weapons, and other exotic gadgets.
Read the rest of the interview to learn a little more about the other two proposed DLC packs, plus more on Operation Anchorage. The latter is said to provide around four to five hours of gameplay.