You may see a few posts on IPv6 through the summer. Keep tuned.
Sonicwall NSA firewall devices DO support IPv6. What they do not tell you is that you need a specific version of the firmware. (5.5.6) When you go to the downloads site, click on the previous versions link and look for the feature release - Version 18.104.22.168-IPv6.
Why they do not mention this anywhere is beyond me. But you've heard it here now. I hope my two days of frustrated hunting around will save you time.