Following the Windows 10 Build 19035 release, Microsoft is rolling out Windows 10 Build 19035.1000 with KB4533028. It doesn't include any change, and is designed to test servicing pipeline.
UPDATE: We have also released Cumulative Update Build 19035.1000 (KB4533028) today that includes no new changes but helps us test our servicing pipeline for 20H1.
Build 19035 was released to the Fast ring a few hours ago. This build comes with a number of general fixes and minor improvements. You can read about its key changes here:
Builds from the 20H1 branch represent the upcoming version 2004 of Windows 10. It's development is near its finish, so Microsoft is not adding new features to the OS.
Also, in the near future the company plans to deliver builds for the next feature updates to the Fast Ring from the RS_PRERELEASE branch, leaving 20H1 builds (VB_RELEASE) in the Slow Ring only.
If you have configured your device to receive updates from the Fast Ring ring, open Settings - > Update &recovery and click on the Check for Updates button on the right. This will install the latest available Insider Preview of Windows 10.