XWayland sadly didn't make it for the recent X.Org Server 1.15 release, but Kristian has gone ahead and re-based the XWayland code against this new release to ease in the eventual merging process. X.Org Server 1.16 is coming in July but there's no word yet whether XWayland will be merged for this next version.
Besides XWayland now riding off this latest X.Org Server code with DRI3, many bug-fixes, and other improvements, he also managed to track down a weird XRandR issue with XWayland. Due to a fix in how Wayland was handling the refresh rate (MHz to Hz), correct modes and geometry is now working along with X.Org GTK3 apps. This fix is actually a big improvement for the XWayland support in terms of more X11 apps now working properly on this Wayland compatibility layer.
Word of the XWayland re-basing was shared on the Wayland-devel list. A few days ago I also did share updated XWayland gaming benchmarks from Fedora 20.