I'm looking forward to when this exists for every almost language. Go added "c-archive" build mode in 1.5. There is no reason gobind couldn't support any language which can work with c libraries (ruby, node, etc).
This exists for Python [0]. The reverse is also interesting (Go -> Java/Python/Ruby) and once I get some spare time, I'll play around with using libjvm to load and call jar files from Go.