id Software today announced that it has begun production on Doom 4, and is now in the process of expanding its internal team of developers to work on the shooter sequel. No details were given on the content of the game or its expected release period.

Doom 4 will be developed in-house at id. The company has not released an internally-developed game since 2004's Doom 3; it is currently also working on the Mad Max-esque post-apocalyptic shooter Rage. No platforms were announced, but the new game is likely to be heading to PC, Xbox 360, and PS3. With the announcement of Rage came details on id's new multiplatform engine tech, known as id Tech 5. Since the release of Doom 3, id has produced the externally-developed Quake 4 (Raven Software) and Enemy Territory: Quake Wars (Splash Damage). In the last decade, it has gone significant amounts of time between its own internal releases, making the current setup of two teams on large titles unusual for the company.