Old news, but Jon Bernthal who plays "Shane" is joining the cast of new series "L.A. Noir":
Not sure if this means Shane dies, or Shane leaves the group only to meet up with them later for guest appearances, or the actor does 2 TV shows like many actors do.
ETA: Trivia. Sam Witwer, the actor who plays the vampire on the US version of "Being Human" played the zombie army guy in the tank in Atlanta. There was an episode that showed how he became zombified that wasn't used. It may become a webisode.