black dahlia99
Here's my theory. Iroh will somehow get out of Ba Sing Se and find them. Afterward, he will convince them to rescue Zuko (because we all know Azula's lying). They'll agree reluctantly and get him. Iroh and Zuko (though unwillingly) will teach Aang his fourth element and Appa will be thoroughly PO'd about having to carry so much weight.
Mmm, I don't think so. I don't think Zuko's going to come back to the 'good side' 'til the end. Iroh... I have mixed feelings about him escaping. I mean, it'd be unlikely in the style of Avatar that he WOULDN'T escape, but I think Azula is too good for that.
As for Aang's Firebending teacher... I'm up for nearly anything at this point. It seems to me like it should be someone who's NOT going to become another part of the Gaang. I think Zuko fufills the fire quota* for that. (He'll come around in the end, but he won't be Aang teacher.) Perhaps someone like Pakku should teach Aang.
I don't think Jeong Jeong is coming back. I think he was just put in as a sort of... what's the word... emotional barrier for Aang against Firebending. Something to deter him from it, or to take it seriously. He was put in as a sort of tool to straighten Aang out and show him that it's serious business.
*Is it just me, or have you guys noticed there's someone of each sort of 'element' in the main cast? Aang's Air, Katara's Water, Toph's Earth, Zuko's Fire, Sokka's strength/weaponry, and Iroh's intelligence/wisdom.