Gametrailers.TV shot an episode at Valve's headquarters and in it they talk a few things about all their products. Well, they also showed the new two map campaign set in an amusement park. Now I know people are still clamoring for more and you are getting more DLC
for the first game so while it's not a full fledge 5 map scenario, you do get a new more fair and balance Versus mode and a new area to kill zombies in. You also get some little snippets of Left 4 Dead 2
in the piece so check it out.