Here are information sharing of exploring OpenStack IPv6:

• Ultimate OpenStack Juno Guide - A Quick Guide to deploy OpenStack Juno on top of Ubuntu 14.04.1, it is IPv6-Only (almost)!

• IPv6 Features in OpenStack Juno - A quick summary of IPv6 feature support in OpenStack Juno
  • YouTube Video of the Presentation
• Journey of IPv6 in OpenStack - A overview of history of IPv6 support in OpenSrack

• OpenStack Icehouse Over IPv6 - An informative guidelines of exploring IPv6 in OpenStack
• OpenStack Havana on IPv6 - A very good design guideline. Although it was explored for Havana release, the overall design architecture and methodology could still stand for Juno and future release.
• OpenStack Traffic Flow - An informative description of how traffic flows through in OpenStack Networking

• A Model for IPv6 Operation in OpenStack - IETF Draft

• OVS currently does not support GRE/VxLAN IPv6 tunnel endpoints
  • http://comments.gmane.org/gmane.linux.network.openvswitch.general/5585
  • https://www.mail-archive.com/discuss@openvswitch.org/msg11486.html
  • http://openvswitch.org/pipermail/discuss/2015-January/016344.html
• OVS Tunneling Diagram

• Port Security Extension for ML2 Plugin and IptablesFirewallDriver
• IPv6 First-Hop Security
• Anti-Spoofing related bug reports and patches
  • A bug report: https://bugs.launchpad.net/neutron/+bug/1274034
  • Patches: https://review.openstack.org/#/q/topic:bug/1274034,n,z

• Using RDO Packstack to Build Neutron
• Dibbler - A Portable DHCPv6