Official Google Blog: IPv6: countdown to launch
googleblog.blogspot.com/2012/01/ipv6-countdown-to-launch.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Today, we’re joining the Internet Society and several major Internet companies to announce World IPv6 Launch, a coordinated launch of the next-generation Internet protocol on June 6, 2012.