Vitess, for YouTube, was announced on Feb 28th.
I also disagree with the idea that this is "marketing". Google have made (and are continuing to make) Go as a replacement for the languages they currently use. They're scratching their own itch.
Finally, I disagree that this is a major differentiator between Go and D. Neither of them push marketing, relying on the enthusiasm of their community to spread the language. They are completely different designs and have very different goals (as noted by others). I do not think that Go will win because of Google's ability to market it.