I wouldn't predict a lot of overlap. On the game dev side, Go offers nothing new, and the forced untuneable gc will be an instant turnoff for the usual reasons. On the Go side, my outside perspective is most of its users seem to be focused on web server backends, trying to justify async everywhere, and/or rewriting slow Python or Perl or Bash scripts and assuming that makes it a systems language.

Go users interested in diving in to SDL or OpenGL bindings to make a game shouldn't be discouraged. Lots of games are made in all sorts of high level languages, the heavy lifting is put onto a few native libraries. But if the goal is to make a general engine, I'd question its utility apart from fun/learning. Again there are game engines in high level languages (with dark native-level secrets in any that try to be performant) but they don't seem to get traction. Even an engine in e.g. C++ doesn't necessarily help your performance goals (http://www.yosoygames.com.ar/wp/2013/11/on-mike-actons-revie...) if your plan is to make it general instead of make it just support whatever sorts of games you're making and planning to make.