Interesting piece of information below in the thread: in reply to "Go being advertised as a systems PL", David Symonds replies with: "It's not. It used to be, but it's not any more."
"Go is a general-purpose language designed with systems programming in mind."
http://golang.org/ref/spec#Introduction
You could nit-pick and say that it says "in mind", but the point still stands that they're trying to imply that it's suitable for systems programming. It is not; certainly not at the level of an operating system kernel, etc.