The book will also tell you how to monetize your mobile game and it describes different business models. It has as a basic the introduction to mobile market and gamers demographics.
While some parts of the book will age rather quickly in the ever changing mobile games world, rest of the book will be useful in the future as well. If you have worked on a game before, the book can summarize what you already know and fill in any gaps.
There are also parts about implemeting certain concepts in popular engines which I felt could have been skipped. I'd rather see more space given to the theory of making games enjoyable than these technical parts.
You can see more details on the Packt website. The book is available as paperback and e-book if you want to save a few bucks.