The War Z's only relative basis from the book are the zombies. Otherwise it has absolutely nothing to do with the book XD
"Supposedly" in dev before DayZ with a War inc reskin, dodgy beta key sales, only two devs with a bit of familiarity and a single gameplay video that shows nothing about the game as a whole.
I hope it's good. Until I see some large multiplayer server gameplay and an overall map won't be holding my breath