I want to write about korra's moveset, so it's a big spoiler text xD:
First of all, she seems really great even if unfinished, fast enough, and has quite a bit of ranged moves.
She uses all elements, even metal, she has a metal whip move which might be down b or down strong. Has good range.
I didn't see an element on air down strong, the ganon spike, but maybe it's air this time and I couldn't tell. And up air seems to be just a regular kick up like the first game but maybe with wind. Other than that most other hits have clearer elements, including her normal attack combo which changes per move.
Her forward air is unfinished but seems to be a fire punch with some range on the fire. Her back air or back strong is a water blade slice backwards.
She has amazing mobility, her forward special is a fire dash that you can use on the ground or in the air, and she has a wind dive down which might be her down air or down special. As well as up special being a spinning wind move upwards that has multiple hits if you get caught into it.
She has an earth move for down tilt or down strong, it puts an earth spike a bit away from her, looks good.
Her up strong(?) aerial is a wind hit upwards that goes quite far, almost like a projectile, seems really good. And her neutral b I think is the water projectile forward. Good medium-long ranged stuff.
She can do a fire move on the ground, forward, that seems a bit slow but possibly strong, it might be a strong forward tilt but not sure.
She has a kicking move forward in the air that also launches a piece of earth/rock, I think it's a small projectile as part of the move.
Her neutral air is the most interesting because I've looked at it and the element of it changes depending on .. which move you last used, it might be cosmetic but it might also have different properties for each.
Oh and she can put water or ice on the floor but I don't know which move that is and if it's just a slippy floor or can do more but seems really interesting :D.