I’d like to imagine you picked this book because its title caught your interest. I suppose you want to make 2D games for iPhone, iPod touch, and iPad, and the game engine of your choice is cocos2d for iOS. Or maybe you don’t care so much about the game engine but you do want to make 2D games for iOS devices in general. Maybe you’re looking for some in-depth discussion on cocos2d, if you’ve been using it for a while already. Whatever your reasons for choosing this book, I’m sure you’ll get a lot out it.