Windows 10 is supposed to be the last version of Windows. All new features from now on are going to be released in sub-versions of Windows 10, similar to how it

Windows 10 is supposed to be the last version of Windows. All new features from now on are going to be released in sub-versions of Windows 10, similar to how it is done on OSX. The first such sub-version release was 1511 (i.e. a build from 2015, November), and this Anniversary Update is version 1607 and happens to be one year after the release of Windows 10, which is why they called it "Anniversary Update".