Coming August 15th, 2012, the newest extension to the Team Fortress franchise, Mann vs. Machine.
Mann vs. Machine is a new co-operative game for Team Fortress 2 that lets you and five friends wage a desperate battle to stop a lethal horde of robots from deploying a bomb in one of Mann Co.’s many strongholds. Take advantage of breaks between waves to upgrade your abilities and weapons. Survive all the waves in any of a variety of missions to earn incredible loot.
To learn more about the release, check out: TeamFortress.com