MacOS X v10.13 "High Sierra" was released today. But you might want to wait. At least one rather nasty-sounding security hole has been discovered.
UPDATE: The security hole was patched within less than a day of High Sierra's release and the installer 10.13.0 installer that most users installed never had the bug.
William Porter is Rucksack's owner and principal. He's been writing on a range of tech subjects for three decades. Yikes!