I bought it a while back - Its presented well, lots of folders, imitation police reports and envelopes with bits and pieces in them. I know there is a proper blueprint for the Bat, and I think there might be one for the Tumbler. Kind of a weird book in general though - it wasn't what I was expecting it to be (I imagined something more like the DK Star Wars visual encyclopaedias).
Stil well worth getting if you're a fan.