ATT DSL IPv6

Hi Everyone, Does anyone know about IPv6 on ATT residential DSL circuits? About 8 or 9 months ago i ran through several IPv6 tests (http://test-ipv6.iad.vr.org/) and they all passed. With all the talk of IPv6 day over the past week i decided to run it again just out of curiosity. However to my surprise, it is returning the result of IPv4 only now. Any ideas why they would have rolled back IPv6? Thanks, Grant