I plan to start working on a "go" <golang.org> binding for proton. I envisage a SWIG binding similar to the other swig-based bindings (python, ruby, etc.) and an API layer similar to the new reactive Python API (based on the C reactor.)
This will be an exploratory effort to begin with, I'd like to hear from anybody who might be interested in using such a thing or helping to implement it. Cheers, Alan.