I think it would be interesting to see Lua become a feature bullet for UE4, and possibly other lightweight languages that can be fit into this existing framework as well.
I have read through the LuaIntegration classes, and I wonder how hard it would be to create PythonIntegration, XIntegration, etc.
I think there needs to be a bit more work to it to have this feature more easily accessible from C++land, but the potential is endless!