The Intel and Red Hat developers are working hard in order to enable Wayland support on Gnome 3.10 Desktop Environment. They aim to enter the Wayland sesson from GDM on Fedora 20, and for Fedora 21, to replace the X.org server with Wayland entirely.
Gnome 3.10 already comes with support for Wayland. The Gnome Shell is being build in two separate binaries, one for X11 (libgnome-shell) and one for Wayland (libgnome-shell-wayland). Mutter, the default window manager of Gnome Shell will also use libmutter for X11 and libmutter-wayland.
Before developing Mir, Canonical has also decided to use Wayland, but they have silently dropped the idea. As you may know, Intel has changed the initial plans and dropped support the support for Canonical’s Mir Display Server.