Microsoft has opened up the Windows 10 Insider Skip Ahead ring, once again allowing enrollments ahead of testing for the next big feature update. Like past enrollments, the Skip Ahead ring is limited in space, but you'll want to be sure to register if you want to be among the first to test out Windows 10 19H2 builds once they're ready to roll out.
Microsoft is starting to wrap up testing on the current update Insiders are testing, 19H1, which is expected to launch this spring. The next update, expected to go under the codename 19H2, will likely launch this fall like past releases.
If you're ready to hop on the Skip Ahead train, you can enroll by heading to your Windows Insider Program setting and choosing "Skip ahead to the next Windows Release." If you opt to stay on the Fast or Slow rings, you'll continue to test 19H1 builds until its broad release.