There is great news from the 2010 GSoC midterms… Atis’ GSoC work thus far on IPv6 has been merged into the main-line Haiku trunk by Axel due to its quality.
No GSoC contributor offered to work on it this year, so, no. But there have been various fixes over the year, so if you are setup to test ipv6, pl ase do so and report any bugs or successes you encounter!