Microsoft has officially stated that the next Windows 10 feature update coming this Spring, and previously called 20H1, will be Windows 10 2004. Microsoft has also removed the Windows Insider watermark from this build, but does note that it does not mean they are completely done working on the build. Insiders in the Fast ring will begin to receive builds from the RS_PRERELEASE development branch again. This also means the desktop watermark will be returning with these builds. As is normal with pre-release builds, these builds may contain bugs and be less stable.
Source: https://www.bleepingcomputer.com/news/security/windows-10-2004-is-the-next-feature-update-preps-for-tests/