This is the first what you could call beta release of Windows 11, hinting that Microsoft is well on track to release Windows 11 later this Fall.
Last week Microsoft released Windows 11 Insider Preview Build 22000.100 to everyone in the Dev Channel. After no major issues were detected, Microsoft has released the same build to the more stable Beta channel.
Microsoft suggests those who would like to test Windows 11 but who are not ready for the wild Dev channel ride may want to switch to the Beta channel now. Microsoft also said they will not be releasing a Dev channel build this week.