The summary goes
Many of the features added to iOS 6 were incremental updates over iOS 5. This is not the case for iOS 7. Apple’s release of iOS 7 brought substantial improvements for both applications and application developers. This book attempts to highlight the features that will be most widely applicable, including upgrading from iOS 6 to iOS 7, making apps more accessible, refreshing content in the background, using the new transition and physics-based animations, building on the new maps APIs, and enhancing your development workflow with the new build and testing improvements. The introduction of iOS 7 is set to change the way users think about native applications as well as how developers think about building them.
Don’t take my word for it. Checkout all the positive reviews its already getting on Twitter.
Remember this is a pre-release; once Apple lifts the NDA, you’ll receive two more chapters covering the huge build improvements, continuous integration, and unit testing improvements. Yippee!
What’s your favorite new iOS 7 feature?