Preface: Never read the book (never even heard of it until now actually), but a quick run through of its Wikipedia page should suffice. 
As far as the book goes, I have to say it looks like an interesting read. I don't generally like "horror" books or whatever it might be called, but World War Z actually looks like it has a lot more depth to it than the usual.
As for what the film looks like... First, it is obviously going to bear just superficial resemblance to the book. I can tell that with just a cursory glance. Second, it unfortunately looks like it is going to be simply another action/zombie movie. True, it doesn't look like it is going to be the usual "I haz zombies with exploding heads! Watch me nao!", but still... I'm also not a big fan of apocalyptic films. I find them to usually be sort of depressing at the very least, but that is just me.