[hercynium]

AFAIK, Packages are available in Arch and the latest releases of Fedora may have Wayland packages available, but it's not (yet) the default window system for either distro. Fedora has been planning to ship Wayland in the main distro for some time, but it's not an easy task, and it keeps getting pushed out to "the next release". They want to do things right, and seem to be the biggest supporter of Wayland, so it may still be some time before a major distro starts using it as their primary GUI layer (aka windowing system, though I'm not so sure that's an accurate term for these things anymore)

In addition, GNOME is busily porting everything to work on Wayland. I think when that is finally done, we will begin to actually get Wayland-by-default on a few dists, and from there, well... that depends on how well it works!

Links to additional info:

  https://fedoraproject.org/wiki/Changes/Wayland
  http://blogs.gnome.org/uraeus/2013/09/09/fedora-wayland-update/
  http://fedoramagazine.org/?p=538
  https://wiki.gnome.org/Initiatives/Wayland
  https://wiki.gnome.org/ThreePointEleven/Features/WaylandSupport

I personally have nothing against either Wayland or Mir, I just want my system to work and if I can get better security, performance, features, etc out of it... score!