Valve is releasing an update to Team Fortress 2 tomorrow, featuring a new game mode. A cooperative game mode. Exciting! Billed as 'Mann Vs. Machine', you will be tasked with working together to defeat your potential new, robot overlords.

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.

Sounds awesome to me! It's amazing how Valve manages to keep Team Fortress 2 fresh and relevant, five years after its release. Check out Valve's news post over at the Team Fortress 2 website for the full announcement, courtesy of Saxton Hale.

The trailer is below.