So far this works on AMDWow 3.1, so I would assume it should work for the same on other servers that are 3.1. I did a search, and nothing came up about this. I even went back numerous pages to see whether or not someone had posted something like already and found nothing.
This really is to simple. It works in PvP. I have not tried in PvE yet. While Unshifted(no form) cast hurricane. While hurricane is channeling, die. Now you have to be channeling it when your being killed. You will stop at 1 hitpoint. Now you can use the rest of your mana pool to unleash onto the other faction. Only part that sucks is that the mana regen sucks or is not even there at all. Haven't found out entirely whether or not you mana will eventually regenerate.