Implementation

BIND 9.0.0 release
support IPv6 related records (e.g. AAAA)
support IPv6 transport (i.e. UDP/IPv6)
you can get it from: ftp://ftp.isc.org/isc/bind9/9.0.0/

patch for BIND 8.1.2
you can use this version if you want stability.
note about security holes, though.
support both IPv6 related records and IPv6 transport.
build it via KAME port or pkgsrc.