This beta version of iOS 10 contains bug fixes and improvements.
You can learn more about all the new features in iOS 10 here. We'll be compiling a list of changes in beta 4 shortly.
Functionality not in iOS 10 beta 4
• Faces in the Photos app do not sync across your devices.
• Functionality that requires adoption from App Store apps, such as iMessage apps, SiriKit, and
Maps extensions, will not be available until those apps are able to adopt and submit to the Store.
Developers can download iOS 10 from the link below. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.