I think there might be a confusion regarding package .
For our regular desktops we need the XOrg server which comes as a binary in /usr/bin/Xorg provided by the xorg-server package in [extra]. You get this by setting --enable-xorg at compile time. Now for XWayland we have our own binary which is completely independet called /usr/bin/Xwayland. You get this binary by setting --enable-xwayland. You can have this as a standalone server by doing --disable-xorg --enable-xwayland, which then only builds XWayland. This is what the xwayland-git package does and therefore doesn't replace your X server and is a safe way to try out XWayland. You don't have two X servers afterwards.
Package  does both it compiles the developer Xorg binary and the development Xwayland binary, but if you want to try Xwayland you only need the last one. If you want the latest Xorg (which actually gets used by KDE et al.) you can use xorg-server-git, which only builds Xorg but not Xwayland. So there is no real need for a package that builds both.
2014-05-28 20:31 GMT+02:00 Lukas Jirkovsky email@example.com:
On Wed, May 28, 2014 at 7:20 PM, Tim Jester-Pfadt firstname.lastname@example.org wrote:
now that XWayland changed to being it's own server binary, rather than a module for X11, there are several obsolete drivers on the AUR which only create confusion. The new XWayland doesn't need patched drivers anymore.
"In the old model, things like modesetting were done in the video driver, unfortunately. In the old model, we simply patched Xorg with a special magical mode to tell video drivers not to do anything too tricky. For instance, the xf86-video-intel driver had a special branch for Xwayland support<
For generic hardware support, we wrote a generic, unaccelerated driverhttp://cgit.freedesktop.org/xorg/driver/xf86-video-wayland that stubbed out most of the functions we needed. With the new approach, we don’t need to patch anything at all." 
There is also an orphaned build of the development X server, which tries
build the old deprecated XWayland approach.  You can see this, because it has --enable-wayland instead of the new --enable-xwayland. Another build is a duplicated of the defacto standard xwayland package (xwayland-git) the difference is that it not only builds XWayland, but
the whole X11 server from the development branch even though this is not needed. People could just use the xorg-server-dev and install xwayland-git and get the same thing.
 https://aur.archlinux.org/packages/xf86-video-ati-xwayland-git/ - Orphaned  https://aur.archlinux.org/packages/xf86-video-intel-xwayland-git/ - Maintained by plfiorini<
 http://blog.mecheye.net/2014/04/xwayland/  https://aur.archlinux.org/packages/xorg-server-xwayland/ - Orphaned  https://aur.archlinux.org/packages/xorg-server-xwayland-dev / - Maintained by maxi_jac<
I wanted to go through the xwayland packages eventually, but since you listed them so nicely... Thank you for that.
I've removed , , , 
I think it makes sense to keep , until the xorg-server-git gets xwayland support, because not everyone wants to have two x servers installed.