The Windows 10 21H1 feature update is now available for testing by enterprise customers before general availability through the Windows Insider Program for Business. Windows Hello multi-camera support, Windows Defender Application Guard improvements, and Windows Management Instrumentation (WMI) Group Policy Service (GPSVC) performance improvements. Microsoft started rolling out a preview of the Windows 10 feature update to Windows Insiders in the Beta channel last month. Microsoft said that the release is targeted for the first half of 2021, with all versions receiving 18 months of servicing.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-21h1-is-almost-here-released-to-enterprise-for-testing/