Seen 1 and 5 years ago but always good to reheat this one...
If you follow the mailing list, they're only using the minimal amount of C++ required for QT, otherwise everything is in C. So in 2013, Linus still doesn't like C++.
Python & QT could be an option, but the whitespace is annoying (I shudder to think what Linus thinks of it) and in general, I prefer using Go over Python, but the creators have said they will not put any resources into developing official UI bindings, so any efforts are purely third-party.