Mutter 3.11.3 has XRandR support for using the hotplug_mode_update property, various fixes, a new MetaCullable interface, a shortcut to move windows between monitors, and various fixes. Mutter-Wayland 3.11.3 meanwhile has similar fixes.
GNOME Shell 3.11.3 has many fixes, support for specifying the monitor for on-screen displays, support for EAP-FAST password requests, window previews are now keyboard navigatable, support for remote search providers without icons, and other minor enhancements.
GNOME Shell 3.11.3 is due out this week while the official GNOME 3.12 release should arrive in March. Other GNOME 3.11.3 changes include greater Facebook integration GTK+ Wayland improvements, and many WebKitGTK+ improvements.