I'm not really familiar with the PyPy tooling and capabilities, but if this takes of, will there be a possibility of interop between RPython language implementa

I'm not really familiar with the PyPy tooling and capabilities, but if this takes of, will there be a possibility of interop between RPython language implementations? It would be mind blowing to be able to write libs in different languages and have them working together. We could always use the best one available regardless of the language. They mention interop with Python code, but I was just wondering if this could go a bit further...