Microsoft has started to roll out a preview of the Windows 10 21H1 feature update to Windows Insiders in the Beta channel. Windows Hello multicamera support, Windows Defender Application Guard improvements, and Windows Management Instrumentation (WMI) Group Policy Service (GPSVC) performance improvements. Microsoft also confirmed that the feature update would be delivered as an enablement package, allowing Windows 10 2004 and 20H2 users to install very quickly. Users on earlier versions of Windows will need to install the full update and take longer to install.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-the-windows-10-21h1-feature-update-to-insiders/