Looking at my own distro, openSUSE Tumbleweed, here are some the applications that directly require libwayland: gammaray, ibus, mpv, and vlc-beta, as well as parts of the gstreamer library. That is despite the fact that openSUSE only has limited Wayland support right now. You can expect that most programs that currently depend on X11 directly will also need to depend on Wayland directly. There are hundreds of such applications in openSUSE right now.
No announcement yet.
Mir 1.0 Expected To Come Early In Ubuntu 17.10 Cycle