A list of all the new toys to play with as a web developer in iOS 9 Safari. 3D Touch, new Responsive Web Design breakpoints, native integration and HTML5 APIs; there’s a lot to get your hands on.
Luis Perez has a detailed breakdown on the accessibility features coming with iOS 7. Good stuff Apple.
iPhone 5 and iOS 6 for HTML5 developers provides a really good breakdown on the changes and additions available for the new device/OS.