Seems that Google didn't well... 'Google' for 'go programming language' first. This type of stuff happens. As per a thread suggestion on the issue tracker, the

Seems that Google didn't well... 'Google' for 'go programming language' first. This type of stuff happens. As per a thread suggestion on the issue tracker, they've already registered Golang.org and its redirecting to their site. For all we know, they are reworking the graphical and text assets right now to make this a full switch.