https://wccftech.com/last-windows-10-build-for-2019-arrives-tonight-microsoft-kills-skip-ahead/

After finalizing Windows 10 version 2004, Microsoft has started to work on Windows 10 20H2, slated for the public release in fall, 2020. The Windows maker has also announced today that Fast ring will now receive the freshest changes and code instead of the Skip Ahead ring. The company said it received "feedback from Insiders in the Fast ring loud and clear that the way we were doing Skip Ahead was a little confusing and frustrating for those who didn’t get a chance to opt-in before the limit was reached."

Insiders in the Fast ring will always receive builds with the freshest code from our engineers regardless of branching off for a specific release. Everyone in the Fast ring is always moving forward!