Hello, there. No wonder King Varian Wrynn is pissed off at Garrosh Hellscream in Mists of Pandaria. While doing quests in the Horde-ally Hozu village, Fort Grookin, it’s revealed orc Shokia has captured an Alliance prisoner — Prince Anduin Wrynn.
This had been hinted in the Alliance’s in-game cutscene, referring to Anduin as White Pawn (a chess term). Check out the screenshots & videos below (video # 2-3 uploading):