Searched and nothing found.
Recently I have found a bug that allows you to kill opposite faction players in Gadgetzan (other neutral zones may work as well).
This bug requires the following:
1. MUST BE A HUNTER
2. MUST HAVE EYES OF THE BEAST
This is how it's done. You travel to a safe (far) distance away from the town.
Use Eyes of the beast and bring your pet to the town.
Attack and kill opposite faction players.
Now, you are probably all thinking that "HEY, WONT MY PET GET KILLED OR THE GUARDS WILL RUN TO ME?" Well, that's the exploit. Apparently when you are far enough away from the town and your pet attacks players inside the town, the guards will aggro for a second or two on your pet, then drop combat.
Here is a video of the pets in action:
Pet_bug_gadgetzann.wmv - FileFront.com