There is work happening on the UI side in Julia. While we are some ways away from building graphical clients in Julia, we do have GTK bindings and such.
Is anyone working on direct Qt bindings (I don't consider using PyCall a viable option). Qt is a bit harder to wrap since it is C++, but it look like Lua has been able to auto generate bindings based on the Qt headers.
Keno Fischer, who recently created the Cxx package [1] used to be a Qt dev, so I wouldn't be terribly surprised if we see such bindings materialize in the future, using Cxx, of course. That said, I don't want to speak for him, so if someone wants this, they should maybe go ahead and start working on it!
For some interesting ideas borrowed from Elm, do see: https://github.com/shashi/Patchwork.jl