https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-the-windows-10-21h1-feature-update-to-insiders/

Today, Microsoft announced that they have started to roll out a preview of the Windows 10 21H1 feature update to Windows Insiders in the Beta channel.

Microsoft also confirmed that the Windows 10 21H1 feature update would be delivered as an enablement package, allow Windows 10 2004 and 20H2 users to install the feature update very quickly.