Martijn Latest rumour seems to be that OS X will become MacOS, but keep that capital M. (Unlike watchOS, which starts lowercased.)

🏒 Lucian Marin Every app bundle has a directory called MacOS that holds the compiled binary for that specific app. I guess it makes sense to name it like that instead of macOS.

Mark Dain Mac OS 8/9 => Mac OS X => OS X => MacOS? Full circle then!