From today's Gamespy newsletter:
Help Wanted: Human Head - Prophet
PlanetQuake passed along word that Human Head Studios is looking to hire level designers with experience developer content with the Quake 3 engine and the Radiant editor. PQ calls the project an unannounced Doom 3 engined game. You can get full details along with requirements and prerequisites at Human Head Studios' jobs page.
Source: PlanetQuake