The Project Stealth Website introduces Project Stealth: Spy versus Mercenary, an upcoming multiplayer stealth/action game built on the Unreal 3 engine. This project is planned as a free release, though they claim the team includes professionals from both the game industry and Hollywood. Here's a bit:

Project Stealth is a Stealth-Action-Multiplayer game aimed at the hardcore PC-player who likes intense teamwork, strategy and on-the-fly tactical planning. A cat-and-mouse-game in which two non-lethal, fast Spies are up against two lethal but slow Mercenaries. On top of that, a difference between third-person and first-person cameras makes Project Stealth a guarantee for an exciting game experience. Both sides are aided by various high-tech gadgets and special vision modes to help them accomplish their goals: infiltrating and hacking an objective for Spies, or preventing that for Mercenaries.