Apple macOS 10.12.6 beta four is now available for download. The latest update brings bug fixes and other performance improvements. However, there is no official changelog yet from the Apple. Currently, the update is available for developers only and a public beta will come out later.
macOS 10.12.6 will likely be the last version of macOS Sierra before Apple ships macOS High Sierra later this fall. macOS 10.13 is currently available in developer beta while a public beta is promised for a later release.
macOS High Sierra includes the Apple File System, HEVC support, Metal 2, improvements to Mail, Photos, and Safari, and more.
Developers can now download macOS 10.12.6 beta 4 update from the App Store.