Fedora 20 is shaping up to be a great release and Matthias Clasen of Red Hat has passed along word that the GNOME Wayland stack is becoming testable. With the latest X.Org Server, Intel DDX driver, and Mutter-Wayland, it's now possible to run the GNOME Shell 3.10 on Wayland with XWayland support.
There isn't yet any Wayland option offered from the GDM log-in screen so for now you need to start a session from a VT and run "gnome-session --session gnome-wayland." Among the limitations right now is needing Intel graphics support, global keybindings aren't working, touchpad support is limited, hot corner and pointer barriers don't work, and Clutter-GTK applications are currently messed up.
For more information on trying out GNOME Wayland today on Fedora 20, see Clasen's blog post.