I would rather see Suki return, having found "The Warriors of Kyoshi" much better upon review, than Haru, whom I often see cited as a potential new permanent cast member, but it could as easily be someone new.
Something else I have been considering is that for the new season the opening narration might be redone, quite possibly with Sokka providing it rather than Katara. I can't cite an example off-hand from
animation, but
Babylon 5 had different opening narration with each season, I could imagine
A:TLA doing something similar. I suppose then at book three, with Aang's final showdown with Ozai impending (or so I would presume) would be narrated by Aang himself (or possibly even Zuko, or the new permanent character, depending upon how the story goes and will go).
Sokka reading the opening narration would tie to another theory, although it might be better called a hope, of mine that whereas book one had considerable emphasis on Katara's trying to become a waterbender, book two may shift proportionally more focus toward Sokka. To what end, I don't know, but the events of "Siege of the North part 2" almost certainly have left him deeply changed and I should hope that the writers capitalize on that.
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