Azula is most likely going to topple off her high throne. Her "I'm better than you ha!" attitude is going to get the best of her. The question is, who will do it? ("It" can equal death, paralyzation, crap-betean-outta-her, ect.) Aang, Zuko, and now Katara all have reasons to strangle her, so who do you think will get the honor of getting her? Maybe all three...
I think Zuko will get her. He has a burning (no pun intended) passion of hatred toward her and he needs to kick her off her high horse! While Aang and Katara both also hate her, he brings a new level of hatred toward her. And Aang will proably be busy with the Fire Lord.