Apple today during the WWDC 2016 keynote at the Bill Graham Civic Auditorium in San Francisco announced next major versions of its four main operating systems—iOS, tvOS, watchOS and macOS—that power its iOS devices, set-top boxes, watches and computers.
iOS 10, the tenth major revision of iOS, is now official, but will it work on your existing hardware? Not if you're still on the iPhone 4s or want to run iOS 10 on the original iPad mini or iPads older than the iPad 4.