What is Windows 10X
Windows 10X is a yet to be released operating system from Microsoft. Originally targeted at dual screen devices, but now to be released to single screens first.
The operating system is thought to be a complementary version of Windows that leverages cloud computing in much the same way as Google Chromebook.
For a good description of how Windows 10X is different to Windows 10 see this article.
There is no expectation that Windows 10X will be replacement version of current Windows 10 versions.
October 2019 – Microsoft releases their vision for dual screen devices based on Windows 10X
February 2020 – Microsoft releases an emulator and tools for application developers.
May 2020 – Microsoft announces that single screen devices will be the first target for Windows 10X rather than dual screens.