As far as it being an apocolyptic zombie movie, it looks decent enough to stand on its own. As far as it being related to World War Z, it looks anything but.
I'm sure it's been covered somewhere in the thread, but the zombies from World War Z were of the slow lumbering type, not the 28 Days Later version. And has been mentioned, the WWZ story is about a reporter traveling the world reporting on how humanity survived after the fact, not as it breaks out.
Maybe Bradd Pitt's character is one of the soldiers depicted in one of the short stories of the book, telling his story alone?