https://www.bleepingcomputer.com/news/microsoft/windows-11-preview-build-2200051-released-heres-how-to-download/

Microsoft has released the first preview build of Windows 11 today, build 22000.51, to Insiders in the Dev channel of the Windows Insider program.

For those unfamiliar, Windows Insider Program allows interested fans, enthusiasts, professionals, developers and even Enterprise users to test the upcoming Windows 10 and Windows 11 versions before they are released.