Multi-language Microservice Environments

Are there any plans to draw up a spec for the various communication elements (particularly service discovery)? To perhaps allow implementations in other languages? A key aspect of micro-services for me (and I expect many others) is the ability to use different languages for different services (as appropriate). I appreciate this library is primarily aimed at Node.js but if there was at least a spec it would open up the possibility of using it in a multi-language environment.