Nice observation by Jason Snell from the Apple quarterly report conference call:
“It probably means nothing, but when Maestri listed off Apple’s four major product platforms, he said this: ‘We’ve built a huge installed base around four platforms: iOS, Mac OS, watchOS, and tvOS.’”
Like Jason, I’ve long wanted a return to “Mac” as the most important part of the OS name, and have suggested it a couple times on Core Intuition. It was a missed opportunity to do this transition after 10.9, when it could have cleanly gone to Mac OS 11 without the .10 and .11 silliness.
The new tvOS and watchOS branding — combined with Apple’s quote above — makes an official rebranding to “macOS” at WWDC this year seem almost likely. The next major version should be macOS 11, without the “X” and “10.x”. That would still look a little wrong compared to simply “Mac OS”, but it would be much better than “OS X”, and the lowercase would be consistent with the rest of the platforms.