As well as releasing the sixth beta of iOS 11, Apple also released macOS High Sierra Beta 6. The macOS High Sierra Beta 6 is now available to both developers and members of Apple’s public beta testing program.
The macOS High Sierra Beta 6 software brings a wide range of new features to Apple’s Mac range of computers.
There are changes to the Photos app, Safari, Siri, FaceTime, Messages, iCloud, Apple File System, HEVC support, Metal 2, improvements to Mail and much more.
As with iOS 11, Apple have yet to give a specific release date for the software. We are expecting them to release the software some time in either September or October. The macOS High Sierra Beta 6 is now available to download for members of Apple’s Public Beta Testing Program and registered developers.
Source MacRumors