This book is for people like me. People who are up for rewatching any of the Alien films at pretty much any hour at all. Repeatedly. People who understand other people's complaints about Prometheus and agree, sort of - but love it anyway.
So, yeah, Alien: The Weyland-Yutani Report is for the fans. The already very established, very devoted fans. For us, it's a cool coffee table kind of book. For other people, it's probably a bit weird, the way it's always weird to deal with someone enthusiastically yelling about stuff you don't think needs yelling about.
(Hey, look, I say "coffee table book", but I have to tell you, I read a digital copy of this and actually don't know what the physical copy is like. I've heard it's beautiful, and hopefully I'll grab one for myself someday. But, yeah, I haven't actually seen the big paper thing.)
Now - don't expect much in the way of new content, because, aside from glorious and hitherto unseen artwork, there's really not any new story in here. Instead, there's detailed photos of spaceships and weapons, flavour texts acting as summaries of each of the films, more W-Y texts stating the definite intent to capture an alien alive. For, you know, reasons. There are blueprints and sketch drawings, and details of various observed forms and life stages of the xenomorph. Oh, and stuff about other W-Y technology - like the androids, of course, and stuff like the thing David uses in Prometheus to peek in on other people's dreams. (Where's the side-story about that nifty thing, huh?)
I think you know whether or not you want to have this book. (Hint: Have you rewatched Aliens twice so far this year alone? You want it, you want it so much.)