Here's what star/producer Brad Pitt had to say about the follow-up.
"We are talking about it. We are going to investigate a script. We have a lot of ideas we will cull from. Nobody is writing just yet, but we are compiling our ideas."
The original World War Z, which went on to gross $539 million worldwide from an estimated budget of $190 million, had several writers credited, including Matthew Michael Carnahan, J. Michael Straczynski, Drew Goddard and Damon Lindelof. It isn't known if the studio plans on bringing one of these writers back for the sequel, or if Brad Pitt's Plan B Productions and Paramount are seeking a new writer.
World War Z was released June 21st, 2013 and stars Brad Pitt, Mireille Enos, Daniella Kertesz, James Badge Dale, Ludi Boeken, Matthew Fox, Fana Mokoena, David Morse. The film is directed by Marc Forster.