Windows Insiders in the Slow ring are receiving a minor update to the latest Windows 10 version 1909 build, indicating that Microsoft is nearly done developing this release.
“Today we are releasing  Build 18362.10022 to Windows Insiders in the Slow ring,” Microsoft announced. “This build includes the improvements and fixes from KB4515384 as well as general improvements to the overall quality of .”
As that link notes, KB4515384 was released earlier as part of this month’s Patch Tuesday updates and it includes both quality updates (bug fixes) and security fixes, one of which is pretty serious. So it’s understandable that Microsoft would want to get those changes into the final version of Windows 10 version 1909.
In addition, Windows Insider Program for Business customers can now ask Microsoft Support to get Windows 10 Version 1909 builds in the Release Preview and Slow rings.