I realize the zombie genre has been beaten to death (ahem..pun intended), but I am nevertheless WAY excited about this movie. I have not read the book (World War Z), but just judging by the preview this is no typical "zombie flick" where the undead are slow creepers who prey upon bumbling idiots throughout the film. These zombies are strong, fast, feral...and pissed off!
According to the following review (which follows the movie preview), this movie doesn't follow the book very well - but it still looks epic in scope. I'm a fan of Brad Pitt too and I'm reasonably confident he is not going to play the star role in a stinker film.
Personally, I think this is going to be bad ass...here's hoping I'm not disappointed!!