The following extensions have been added/updated:
accountsservice, clutter, clutter-gst, clutter-gtk, cogl, dbus, elogind, gdm, gnome-session, linux-pam, mutter, polkit and shadow
..to allow gnome-session to work in wayland mode, which it now does by default.
Please read the elogind and gnome-session info files to see how to get started.
Note that, on an intel core-i7, gnome-session now takes 15s to start in wayland mode and 25s to start in X11 mode - as opposed to 5s previously - but, once started, it seems to work at the same speed as before.