14 DAY TRIAL // Today, August 1, 2016, Apple has started seeding the fourth Beta builds of its upcoming iOS 10, macOS 10.12 Sierra, watchOS 3, and tvOS 10 operating systems to registered developers, along with Xcode 8 Beta 4.
These new Betas come approximately two weeks after the release of the third iOS 10, watchOS 3, tvOS 10, and macOS 10.12 Sierra Beta milestones, allowing application developers who have a paid Apple Developer account to install them on their registered devices and get an early taste of what's coming to the final releases this fall, and to prepare their apps for the new OS versions.
The macOS Sierra 10.12 Beta 4 (16A270f), iOS 10 Beta 4 (14A5322e), watchOS 3 Beta 4 (14S5302d), tvOS 10 Beta 4 (14T5308d), and Xcode 8 Beta 4 (8S188o) are all available as we speak from your Apple Developer account or directly from the official update channels on the respective operating systems.
New Public Betas of iOS 10 and macOS Sierra are coming soon
While Apple has not published any details about the changes included in these new Beta releases of the iOS 10, macOS 10.12 Sierra, watchOS 3, and tvOS 10 operating systems, it is worth noting that Beta 4 of Xcode 8 comes with the latest Swift 3 programming language and SDKs that you can use to build and test your apps for upcoming OSes.
Now that Beta 4 of iOS 10 and macOS 10.12 Sierra are out, Apple should prepare to unleash the third Public Beta builds of these operating systems to the rest of the world, which should be available in the coming days. If you still don't know how to install the iOS 10 and macOS 10.12 Sierra Public Betas on your devices, we've prepared two nice tutorials for you, here and here.