I briefly tried Pokemon Go when it came out and haven't played much since it drains my battery quickly and uses a lot of data. But I'm very interested in this topic, so I picked up this book. It's a really good overview and record of the game. It does an insightful and entertaining job at explaining the diversity of game play, highlighting cool game locations, and explaining ongoing social issues regarding game play.
It's a very interesting, well-written, and designed book (it's presented like a tourist guidebook). I would have preferred a few less generic and full-page photos and more tips and author's insight.