Deadline tells us that NBC has bought the spec script for ZvV, which they describe as "set in a world where zombies are a part of society, controllable with medication. The show's two leads (one secretly a vampire) are cops assigned to a squad specifically formed to deal with "zombie crime". That's not a bad little setup for a show assuming it goes to the right hands. Unfortunately I'm not sure that's the case.
The spec script is being written by Austin Winsberg, whose most prominent TV gig to date is creating the lame duck rom-com-sitcom Jake in Progress starring John Stamos. That's not very encouraging right out of the gate, but it's not as worrisome considering that Warner Bros. TV and Wonderland (McG's company) are producing. I know McG's involvement in things is normally not something to get overtly excited about, but he has been a producer on Supernatural from the very beginning, and that show is the best horror programming network television has had in years.
Since Zombies Vs. Vampires is just a speculative project at this point, it may never even have its pilot filmed, but so far it's something to keep an eye out for.