Disclaimer: Please do not visit links or read below if you do not want to see any possible Cataclysm spoilers!

Vol'jin is a badass mofo!

Pip sent me a tell earlier leaking some possible information about the upcoming relationship between the Trolls and Orcs (well, more Garrosh...) It was from Fail PUG.

Transcript:

"Garrosh Hellscream: Don't talk back to me, troll. You know who was left in charge here. Have you not stopped to ask yourself why Thrall chose me instead of you?

Vol'Jin: Dere's no question why, Garrosh. He gave ya the title because he needed ta see once and for all if ya could overcome the pride and bloodlust dat have long run in ya family. I t'ink he did not expect de answer to be apparent so soon.

Garrosh Hellscream: You're lucky I don't gut you right here, whelp. You are foolish to think you can speak to your Warchief in such ways.

Vol'Jin: You're no Warchief of mine. Ya've not earned my respect, and I'll not see the Horde destroyed by ya thirst for war.

Garrosh Hellscream: And what exactly do you think that you are going to do about it? Your threats are hollow. Go slink away with the rest of your kind to the slums; I will endure your filth in my throne room no longer.

Vol'Jin: I know exactly what I am going to do about it, son of Hellscream. I will watch and wait as ya people slowly become aware of ya ineptitude. I will laugh as dey grow to despise ya as I do.

Vol'Jin: And when da time comes dat ya failure is complete and ya "power" is meaningless, I will be dere to end ya rule swiftly and silently.

Vol'Jin: Ya will spend ya reign glancin' over ya shoulder and fearin' the shadows, for when da time comes and ya blood slowly drains out, ya will know exactly who fired da arrow dat pierced ya heart.

Garrosh Hellscream: You have sealed your fate, troll.

Garrosh spits at Vol'Jin.

Vol'Jin: And you yours, 'Warchief.'"

So. Epic.

Now, it's been confirmed that this dialogue does exist, though I haven't been able to find out any quests, events, etc. that lead up to it.

MMO Champion has verified this with more transcripts from Garrosh and a YouTube video. (Note the dialogue with Vol'jin seems to end about halfway or 3:00)