https://www.bleepingcomputer.com/news/microsoft/windows-10-2009-is-almost-here-released-to-enterprise-for-testing/

The Windows 10 2009 feature update, also known as Windows 10 20H2, is almost ready, and Microsoft has released the latest version to the enterprise for testing via the Windows Server Update Service (WSUS).

Like Windows 10 1909, Windows 10 20H2 is being released as a full update and as an "enablement package" that turns on features laying dormant in Windows 10 2004.