I think most people are anticipating Korra doing Avatar-stuff. I've been waiting for her to talk to Aang. But I don't think think they're going to let her do that until at least for another episode or two, considering that if she talks to Aang, she can probably solve a few of the mysteries.
Zuko is still alive; he handed the Fire Lordship over to his daughter 3 years back. That info is on some Flash companion to The Legend of Korra on Nick's site.
http://www.nick.com/games/legend-of-korra-welcome-to-republic-city.html?navid=showNav
They've slowly been unlocking it, and it's finally unlocked all the way through \O/
Stuff Korra and Aang. Amon rules dis show nao @_@