This quest is no longer available within the game.
Meet Wrathion upstairs on the second floor of the Tavern in the Mists in the Veiled Stair.
There's someone I'd like you to meet. Stormwind's own crown prince recently paid a visit to this humble inn. I've instructed my guards to defend him from any Horde aggression - I don't want to draw any undue attention to myself.
He and I have been discussing world events, such as the battle along the southern shores, his encounter with Garrosh, and the upcoming assault on the Thunder King.