This first link will take you to their blog showcasing what they have done and the new features and a video, how to update your game and a long list of patch notes.
See video here. I also reccomend reading the video comments the developers make some great comments in there.
This second link will lead you to 003a hotfix information consisting mainly of server side fixes and changes for the client.
Once I pick this game up and a couple of other games on here I am not sure how I am going to find time to play them all! There's so many great zombie survival games out there currently in the making.