Red Hat's Adam Jackson has proposed a set of ten XWayland patches that be merged into the mainline X.Org Server. These changes lay the groundwork for merging the rest of the X.Org Server changes for supporting this X11 compatibility layer to Wayland.
The ten patches that were proposed for the X.Org Server today are the ABI changes necessary for supporting the modified XWayland-compatible DDX drivers and for running the X Server as a root-less window on Wayland.
The ten patches for now are sitting on the xorg-devel mailing list
but will hopefully be merged (ideally with the rest of XWayland) for X.Org Server 1.15, which is to be released by the end of the calendar year but the merge window will be closing around the end of the month.