Microsoft officially announced Windows 21 version 1H10 last month. She is a little one information which will upgrade Windows version 20H2.
When Microsoft first announced the 21H1 version, the Insiders in the Beta channel they had the option of having the 21H1 build or the older 20H2. Now, all Windows Insiders in the Beta channel will be able to have version 21H1 as a recommended update.
Microsoft's Brandon LeBlanc described the change in the release notes for version 21H1 19043.844:
Update 3/2: 21H1 is now available as a recommended update to all Windows Insiders on the Beta channel.
As LeBlanc explained, if one Insider had chosen not to download 21H1 builds, will start receiving them automatically through the Beta channel.
Build 21H1 is a relatively minor update compared to some other semi-annual Windows 10 feature updates. 21H1 focuses on business-oriented features and improvements, such as more camera support for Windows Hello improvements and Windows Defender Application Guard
A much bigger update will be released later this year. Codenamed Sun Valley, the update will include an updated design, new features and updated applications. The biggest update is expected to be released in the second half of this year as Windows 10 version 21H2.