Deathwing has a secret…
I doubt this is something that will be revealed in Cataclysm. In fact, I doubt it’ll ever be openly revealed at all. Virtually every great story has subtext. You may have the plot, the story at face-value, but the subtext is what’s *really* going on.
Deathwing has a secret, and while it may never be openly revealed, once you know it, a whole lot of things suddenly fall into place.
So what is it?
I believe Deathwing is in love with Alexstrasza… that beneath all the bile, fire and death, Deathwing destroyed Azeroth in a horrible misled attempt to impress her. I think that Deathwing has a deep-down problem with failure. He cannot forget he was Neltharion the Earth-Warder. He knows he failed at his original purpose, and the only way to make up for that is for him to succeed at his new self-chosen purpose. I think the rage we saw in Deathwing during his fight with Alexstrasza at Twilight Highlands was his own self-hatred for yet again failing, this time to convince Alexstrasza he was powerful enough to be worthy of her. He could have killed her, he didn’t. Perhaps he hopes she’ll come around and finally understand.
Cataclysm is ultimately a love story. And like I said, I don’t think this will ever be revealed in game. Perhaps it’s even still locked in Chris Metzen’s head, but I firmly believe it’s there. Too many things make perfect sense once that story element comes into play.