Looks like a new Team Fortress 2 mode has been announced by Valve. They are calling this Mann vs. Machine. This new mode has both sides going up against a new enemy, robots. This is a co-op mode which looks to be a horde-style mode game.
And like many horde-style games out now, you will be faced with enemies coming in waves. You’ll only be able to upgrade weapons and abilities during a break between waves of enemies. The enemies you face will range from hand-to-hand, sword, baseball bat, bowmen, snipers, bombers and many more.
This new update is set to release tomorrow, August 15, 2012.