I know of one unofficial Go SDK in the works. When we fully support an SDK we really support it by dedicating headcount to those SDKs. Things are obviously still evolving, and Go support is definitely on my wish list.
IMO, you can't really talk credibly about having "Fanatical Support for Developers" if you don't support at least one compiled systems-development language, i.e., C++ or Go. But I'm sure I'm in the minority.
While Gorax isn't on the "official" list of bindings supported, I'm taking it upon myself, as a Racker and Go enthusiast, to maintain the Gorax project.
Please see the project page at github.com/racker/gorax. Thanks!