Left 4 Dead 2 : November 17, 2009

L4D2 has been announced with a slated released date of November 17. It comes with new melee options like the chainsaw, frying pan, axe, baseball bat, and additional blunt-force objects. Valve has also detailed the new AI Director 2.0, which will not only affect how many of the undead you'll be tackling at any given time, but will also dictate weather effects, world objects, and pathways provided to the players.