With tonight's GNOME Shell 3.23.90 release is handling Ctrl+Q and Ctrl+W in portal windows, reloading of apps when the .desktop file contents change, fixing for sub-surfaces not showing up in previews, kill-switch has been added for user extensions, and a nightlight indicator has been added to the status area. There have also been a number of bug fixes to the GNOME Shell as it gets ready for the GNOME 3.24.0 release in March.
More details on GNOME 3.23.90 changes via this Git commit. As a reminder of some of the GNOME Shell work earlier this cycle, there's been continued Wayland improvements, the discrete GPU launch option, and a lot of smaller improvements and polishing.
Mutter 3.23.90 meanwhile has improved EGLStream support (helping NVIDIA's binary driver), some HiDPI adjustments, a few tablet improvements, and other enhancements and bug fixes.
GNOME 3.24 is expected for release on 22 March.