I saw this while searching on Google:
And after clicked on the "Try it now" link, I was led to ipv6test.google.com/ :
It has been launched yesterday, as seen on Google Japan blog ;-)
On this URL, I get different results each time I go on it (same browser, same connexion)
The test isnt working properly, I have a full IPv6 Stack and I can use all IPv6 enabled services (including googles) but the test always fails.