Apple released the first public beta of the desktop operating system macOS Sierra 10.12.6. A public beta became available after a day of closed testing developers and a few days after the release of macOS Sierra 10.12.5.
To access the beta test through the Apple Software Beta Program by signing in with your Apple ID, and registered users through the standard update mechanism in the Mac App Store.
apparently, macOS Sierra 10.12.6 will be a small update with a focus on “under the hood” changes, increasing the stability, compatibility, security, correction of errors and defects.
As expected, macOS Sierra 10.12.6 will be one of the latest updates for macOS Sierra 10.12, while Apple will begin to shift focus on macOS Sierra 10.13. The announcement of macOS Sierra 10.13 is to be held at the conference for developers WWDC 2017 (Apple Worldwide Developers Conference) to be held in San Jose from 5 to 9 June.