The campaign is coming along nicely and we have recently decided to add some of the other maps Darth_Brush has made to give it a little more excitement and replayability.
At the moment, I can't tell you what exactly we're adding but be sure that you will find out more soon.
In the meantime, check out www.l4dmods.com for more info about other campaigns hitting the servers real soon.
We are always looking for people to help out, do you have the skills? Do you want to learn the skills? Everything you need to get started is over at www.l4mods.com!