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The operating system for Macs could see a name change to "MacOS" at this year's Worldwide Developers Conference



From MacRumors:
Unlike the first time "MacOS" was spotted on the Apple website, the iTunes Connect mention uses "macOS" with a lowercase "m" that better fits with the lower case letters used in iOS, watchOS, and tvOS.

It continues to be unknown if the macOS mention is a mistake made because of the naming of Apple's other operating systems or an error made because of an imminent name change planned for OS X.
  Apple Again References 'MacOS', This Time on Developer Website