Uh... All I see is the typical angry female lead trying to prove herself to the world. How is that more layered than Aang's young boy growing to his role as leader?
I'm not seeing it. It doesn't look and more, or less, 'layered' than before.
Mostly it's the difference in how they interact with their respective environments. Yeah, Korra looks like she's a safe bet to place square in the "resentful rebel youth" column in some respect, but she's at least there
, taking part in it. Aang was sorta...how to put it...basically, because of a) the time-hop, b) his difficulty coming to terms with being the Avatar, and 7) his preference to stay more or less a kid as long as he could, he ended up fairly detached from the world. He explored it, yes, but he rarely seemed like he belonged in it or was a part of it. The only time I recall him really acting on the world around him in more than a doing-what-I-want-before-I-blow-town sort of way it was when he hooked up with the lead earthbender guy, and that was because he'd known him pre-time-hop. It made him fairly static as a character, since he wasn't willing to let the world have much effect on him, or vice versa if he could help it. This changes more in the last season when shit gets real, son
, but by then it's mostly just combat/direct conflict, not really a coming to terms kind of thing. I just never found myself able to care about him because it seemed like he
was trying his hardest not to care either for the longest time.
Rebel youth might be cliche, but at least it's a direct interaction with society (specifically rebelling against it) instead of trying to ignore it altogether.
Granted, this is just what I'm getting out of a 90 second trailer.