Ubuntu 13.04 Enables The Wayland Support For GTK+

[uid313]

For applications not ported yet to just use libWayland instead of Xlib, how does one run them under Weston, using a Xorg server inside weston?

There is XWayland for that.
But XWayland is still under development and has not yet been merged into mainline X.org.

Xwayland integration is on the TODO list of Xorg 7.8.

http://www.x.org/wiki/Releases/7.8