Most users update within the first few weeks of availability -- in December, iOS 7 had achieved 78 percent adoption within its first three months. The next update, iOS 8, will not only improve on existing features in iOS 7 (and share compatibility with most devices, except the iPhone 4), but add new features such as Handoff to OS X 10.10 Yosemite, smart home appliance support, the new Health app, better app integration with system services and much more.
Apple is expected to launch iOS 8 alongside the next generation of iPhone, presumably called the iPhone 6, which is expected to offer at least one model with a larger, 4.7-inch display. Currently, this is expected to happen sometime in September or October. There have been unconfirmed rumors of the company also developing a 5.5-inch model, but to date no solid evidence has been revealed that would indicate such a device is currently in or about to enter mass production.



