Microsoft have pushed the Windows 10 May 2020 Update (20H1) to the Release Preview ring. The update is labelled version 2004 (for April 2020) and is now officially called the Windows 10 May 2020 Update, many of were previously calling this the Windows 10 April 2020 Update but it is now officially May 2020. The update going out to the release previewing ring is build 19041.207 (KB4550936) and includes all the features and changes currently in the slow ring along with some new fixes:
This build is cumulative and includes all the fixes released to Windows Insiders in the Slow ring in Build 19041.21 through Build 19041.173.
We fixed an issue that causes the Remote Procedure Call (RPC) service (rpcss.exe) to close unexpectedly and the device stops working. Then you must restart the device.
We fixed an issue that causes the Device Enrollment Status Page (ESP) on managed devices to stop responding if a policy that requires a restart is installed on the device.
We fixed an issue that might prevent the rear camera flash from functioning as expected on devices that have a rear camera.
It also includes the latest security updates to the Microsoft Scripting Engine, Windows Kernel, Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Media, Windows Shell, Windows Management, Windows Cloud Infrastructure, Windows Fundamentals, Windows Authentication, Windows Virtualization, Windows Core Networking, Windows Storage and Filesystems, Windows Update Stack, and the Microsoft JET Database Engine.
If you are a Windows Insiders on the Release Preview ring you can check for updates and you should see version 2004 offered as a download.
A word of warning for Windows Mixed Reality users. Microsoft say there are issues with this release that won’t be fixed until early May so I would avoid installing it if you use WMR.