Still reading it (up to Chap 11 of 15).
Covers creating 2D games for iOS using the cocos2d 2.x framework, and Kobold2d 2.x framework. All code is in Objective-C, and it's expected you know Obj-C to understand the content. If you've done any OS X or iOS development already you'll have no problems following along. The frameworks are really simple to learn and use.
It does promote some inexpensive pay-for tools to aid in development, but always offers a free alternative if available. TexturePacker, Tiled (qt) (free), GlyphDesigner, and ParticleDesigner.