Several months have passed after my first proposal but now ip_map has become an official auxiliary module of metasploit. They probably didn't like proposed name and decided to rename it into ipv6_neighbor. I think it was a good decision because the *map names has been used too much in past years (E.g nmap ... and of course: sqlmap).
Thanks to offensive-security for quickly adding an ipv6 discovery section in theirMetasploit Unleashed. If you want to know more about ipv6 insecurities I strongly suggest the excellent paper from Antonio Merola.
