So with Vol'Jin being the new warchief I had this tickling at the back of my brain that something had happened during Cata that might hold some precedence now. It took me awhile, but I found it.
Sylvanas resurected Galen Trollbane, who in turn reclaimed Trol'Kalar. The sword is meant to be used against Trolls, since it inflicts more damage to them and negates a trolls regeneration ability. But there isn't that much information on it so I'm not sure where else to go with this, just thought it was interesting enough to share and I am generally curious to see what other people might have to say.
(All my information comes from Wowpedia, but there isn't much "Official" to look at so meh)