"Police officer Rick Grimes leads a group of survivors in a world overrun by zombies."
Well.. we know its much more than that.Walker(s) Walkin
Glen Mazzara: “Greg Nicotero [and John Esposito] were just awarded a Writers Guild Award for their webisodes, so that same team is going ahead with a new round of webisodes to bring us into season 3. They are just beginning write that material. I’ve seen a treatment for it and I believe Greg is going to direct that as well. So yes, there will be new webisode coming before season 3.”
More info here.