I wouldn't doubt that the next 3 seasons are already written. The show itself is also planned out, as minor questions formed in one episode may not be answered for another 10 some episodes later, so it's not just another Nick 'story' show like Danny Phantom, all episodes are connected and well planned out. The bending styles all coincide with different styles of fighting and can be seen in every episode. The research put into the story is amazing. It's good to know that children that watch this show may actually learn what it takes to have a good story.
Not since Samauri Jack has an American show been able to pull off an anime style that works. This show is what Nickelodeon needs to give it some respect. The art and research put into this story matches the quality of the plot and character development.
