Heh... it's a RARE drop that only occurs in Dark Shore. I was in there yesterday, but the place to potentially get it is too difficult for me to solo, not to mention that it's Alliance territory and little guys kept trying to gank me. Eventually I died and just hearthed out.
We could go back in force, though.
That might attract a lot of attention, though. If we were to get the pattern, that would be an awesome money maker because EVERY warlock gets this quest, though it's not very important.