Mae Whitman, the voice actress of Katara from The Last Airbender, recently stated in an interview that she expects to eventually begin voice acting for another character involved in The Legend of Korra.
This answer was formed when Whitman was asked, “Is there any possibility that you might come back to record for The Legend of Korra at some point, too?
Mae’s exact answer is as followed:
I’d say, definitely. Those guys are all my friends. We’re cut from the same cloth, and I’m obviously a huge fan of that as well. I love that the fans are so passionate about it. And going to Comic-Con and seeing people dressed up as Katara just makes me so happy. I’m also glad there’s a new story to follow. I know it probably wouldn’t be Katara, but if there was any way I could be a part of that — and I think it’s on their radar that I’m really passionate about all their projects — I wouldn’t be surprised if I somehow weaseled my way onto that show as well.
I wouldn’t use this quote to form any kind of factual statements as Whitman is probably as knowledgeable about Book 2 as we are, but it’s obvious that she genuinely believes she’ll eventually be called upon to voice act again.
Maybe Mike and Bryan will get creative and device a character for Whitman that is some sort of descendant of Katara?