We may have helped him in Pandaria, but we certainly didn't fulfill whatever it was Wrathion had on his peculiar wishlist of things to do in regards to his plans for Azeroth. The Black Prince has stated on more than one occasion that he seeks to protect the world from some kind of impending attack by the Burning Legion. He even showed us the vision he'd seen as part of the expansion-long legendary quest chain in the last expansion. Yet when the chain came to a close, Wrathion was less than pleased with the results -- he wanted a clearly defined winner in the battle between Alliance and Horde, and he didn't get it.
It was his next plan of action that was perhaps the most surprising, however. In the novel War Crimes, Garrosh Hellscream is placed on trial, and the end result for the former Warchief was a trip back in time to an alternate version of Draenor, courtesy of the bronze dragon Kairoz. But Kairoz wasn't alone in his efforts to take Garrosh back. Wrathion helped him out. And that's pretty strange when you think about it, because unleashing the Iron Horde on Azeroth seems like a really funny way to protect the planet. So what gives? More importantly, where is Wrathion now?