Well, it's finally here, the first new campaign for L4D. It's set to last 30 minutes long, and cost 560 Microsoft points. PC users will be getting it free. Keep in mind that the cost isn't Valve, it's Microsoft that is making them set a price.
The campaign if supposed to link No Mercy and Death Toll better. It will come with new survival mode maps, and For Versus mode there will be a recharge timer for infected team-mates, and adjusted item-spawn behaviour. The campaign is going for a September release. no actual date just yet.
There is going to be new dialogue, and a so called explosive finale. I myself am hoping for a few more achievements. Not to boost my gamerscore, but to give me something to work for on L4D again, bringing back those days of fighting to complete expert.