Another Microsoft rumor that's making the rounds is about a new light-weight operating system intended for devices similar to the Google Chromebooks. This "Lite" operating system may not even be called Windows, and it's said to exclusively run UWP apps and PWAs from the Windows Store. A lot of legacy components will be stripped, in effort to make this operating system lighter and faster:
Lite is said to only run UWP apps and PWAs from the Store, and it will strip even more legacy components from the OS. This is so that the software becomes lighter and faster, while also enabling instant-on and always-connected capabilities, as well as making the OS more suitable to run on different chipset architectures such as ARM. It remains unclear, however, if this means Win32 apps from the Store won't be supported, since they are still supported in Windows 10 in S Mode.
If it does indeed support only UWP apps, Microsoft would also be making a push for the platform, which has been seen as dormant for a while; the Redmond company itself seemed to abandon its Office apps built on the platform a while back, but that would likely need to change in order to fit this strategy.