Ubuntu and Debian does not compile GTK+ with the Wayland backend enabled.
Ubuntu does not yet have PAM set $XDG_RUNTIME_DIR.
Weston does not support minimize on windows.
Weston Terminal does trigger Enter when you press the right Enter button on the numpad.
Xwayland is not yet merged into the radeonhd and nouveau drivers.
Ubuntu's thin scrollbars causes application crashes and needs to be disabled (export LIBOVERLAY_SCROLLBAR=0).
libcanberra-gtk3-module causes crashes and needs to be uninstalled.