I do believe marketing has something to do with it. I don't believe a random Google employee is allowed to disclose stuff about their infra permission is granted. This is not a bad thing mind you. Google is merely trying to win minds in the most friendly way possible.
Neither did I said that this was a 'major' differentiator between Go and D. Just 'a' differentiator and not a major one at that.
There's less bureaucracy than you imagine. I asked a couple coworkers from the Go and Downloads team, "hey, should I post about this?" and they were like, "yeah, go for it."
But yes, it's kinda marketing because I love Go (which is why I joined the Go team), and I wanted to spread my happiness and want to see other people use Go.
But the Official Google Marketing Department was not involved. We don't have any fancy videos like Chrome. Just me emailing.
Neither did I said that this was a 'major' differentiator between Go and D. Just 'a' differentiator and not a major one at that.
I have become slightly myopic with regard to the little announcements. I'm confusing it with announcements like Bitly's: http://word.bitly.com/post/29550171827/go-go-gadget or Cloudflare's: http://blog.cloudflare.com/cacheing-the-uncacheable-cloudfla.... But the point still stands, I see more of these posts related to Go than posts related to D (or Clojure/Scala/Rust/...).