I just checked and determined that there appear to be no AAAA records yet for the WMF servers.
I have to admit to having been negligent in examining the IPv6 readiness of the Mediawiki software. Is it generally working and ready to go on IPv6?
Does the Foundation have a IPv6 support plan ready to go?
The importance of this is going to be high in the Asia-Pacific region within a few months: http://www.potaroo.net/tools/ipv4/rir.jpg
(APNIC runs out of IPv4 space to give to providers somewhere around August, statistically; RIPE in Feb or March 2012, ARIN in July 2012).
In each region, ISPs then will start running out of IPv4 to hand out within a month to three months of the registry exhaustion.
We have a few months, but by the end of 2012, any major site needs to be serving IPv6.
Out of curiosity, is anyone from the Foundation on the NANOG mailing lists?