This has been partly done several times with Lua (one by myself). One problem is that JUCE is not a C framework, it relies heavily on C++ features (notably, using it means deriving lots of parent classes and interfaces). This makes language bindings a bit more tedious, especially if you want your binding to keep up with JUCE's non-stop development.

So it would take a really strong incentive for someone to create and maintain a full-featured binding to another language.