The official GNOME 3.22 desktop release is happening this month.
GNOME 3.22 Beta 2 was announced today by Matthias Clasen. GNOME 3.22 is under an API/ABI freeze, feature freeze, UI freeze, and string freeze ahead of the official GNOME 3.22.0 release.
For this second beta are some last minute Wayland fixes/improvements.
The 3.21.91 release announcement can be read via the GNOME mailing list. GNOME 3.22.0 is planned to be officially released on 21 September.