Apple released 6 beta of macOS High Sierra. The update is already available for developers participating in the test program to Apple.
One of the most interesting innovations in macOS High Sierra is a new file system APFS that will be used instead of HFS+. The transition to technology will provide native support for encryption, instantaneous copying of files and directories, more reliable protection against bugs and glitches.
If you have an account developers download macOS 10.13 beta 6 right now. Update available through the app store, the Mac App Store. The final version of macOS High Sierra will be released this fall.