We actually have a pretty out of date version of Go installed (definitely pre-Go 1) and Go App Engine SDK (I think it's 1.5.0). However, I did
write up some documentation back in May 2011 (when we last updated our Go and Go AppServer) that details how to update them to the latest version, so it should be possible to update it without too much work. Which APIs are you looking to use? Since the Go SDK defers API calls to the Python SDK, we support most of the Go APIs without any extra effort on our end, but I'd be glad to double check depending on what APIs you're using.