Since Go is still in development and with updates being released regularly, does this mean that the GCC GO compiler implements a specific version of Go and will be out of date soon?
Unless the gcc team is prescient, I don't see how any other conclusion can be drawn.
Basically, yes, it'll be increasingly out of date.
Edit: clarity.
You can follow their golang-announce mailing list or check this page http://golang.org/doc/devel/release.html to see if a backward-incompatible change has been released.