The new beta is available to users who have signed up for the Apple Beta Software Program. You can learn more about all the new features in iOS 10 here.
The Apple Beta Software Program is now available for iOS 10. You can enroll your iOS device to get the latest public betas from Software Update. If you were testing a prior operating system, please re-enroll your device to start testing the next release.
If you haven't already, you can enroll your device at the link below...