We've already heard, as you may know by now, that Malygos, the blue dragon aspect, will return in Wrath of the Lich King, and, as the Guardian of Magic, is supposed to be a little unhappy at all the Mages running around. Malygos' big thing is that he wants to keep magic from the mortal races-- he doesn't trust them to use it without destroying the world. The only thing that's kept him from doing something crazy is the fact that he hasn't had a dragonflight for a while-- Deathwing wiped them out, more or less.
But in Wrath, Malygos is back, and so is his mind, and so is his dragonflight. The Blue Dragonflight is returning (thanks to Alexstrazsa's help), and as Metzen told us at BlizzCon, Malygos is waking up, looking around, and seeing all these little mortal players wielding magic like it was a game (a massively multiplayer game, more appropriately). And so he's not likely going to be happy with Mages when we arrive in Northrend.
To which Takeru says: maybe Malygos is right. Maybe we shouldn't be using magic for our own purposes-- look what it did to the elves. Non-mage players are even saying we should give up the Mages to Malygos anyway-- what did they ever do for us, right? (err, besides make water and food and port us around and polymorph our enemies...)
At any rate, it probably won't matter-- Malygos will probably bring the war to us, and if he doesn't, then the Kirin Tor (also in Northrend) will probably bring the fight to him by recruiting us to do it. Either way, we'll likely find the Aspect of the Blue Dragonflight on the wrong end of our pointy sticks.