http://www.ign.com/articles/2012/08/14/team-fortress-2-adding-co-op Okay now even n00bs like me can enjoy it :trollface2:
Not even I could carry your n00b ass nas In all seriousness. Probably the most exciting update since the first weapons/hats were introduced.
So far co-op seems to be the same as normal pubs. Ignore your medics. I wish there was a taunt where I could slap everyone on the back of the head to alert them or something... Demo is pretty easy. Having the ability to trap and run away is helpful with the mobs. Scout seems more difficult just because you have to focus on so much while trying to meatshot. Pyro is very handy against those sentry busters and an ubered pyro can easily take down mobs at the start of each wave pretty quick.