Originally conceived and heavily tested as a versus campaign, version 2 constitutes a pretty big art pass, a significant addition of custom content, and small tweaks to the geometry for both vs. and coop.

Though coop is encouraged and conscientiously supported, this is still a versus campaign at heart...if you get a chance, play it that way. 

For those who think vanilla versus is a bit too kind to the survivors, disable the survivor handicapping in confogl and alternatively try this approach.