I'm not aware of anyone working on IPv6 support.
The following looks up to date and may be helpful:
On Fri, Aug 16, 2013 at 8:27 AM, Andrew Pennebaker
<[EMAIL PROTECTED]> wrote:
> When will Hadoop get better IPv6 support? It would be nice if Ubuntu users
> didn't have to disable IPv6 in order to get Hadoop working.