Set roughly 70 years after the original series, the new series follows the new Avatar in Korra. Having already learned water, fire, and earth bending, she leaves home and ventures to the United Republic in search of Tenzin, third son of Aang and Katara and the only known master air bender. Along the way, she meets and befriends brothers Mako, a fire bender, and Bolin, an earth bender, and joins their team in participating in the sport known as Pro Bending. However, during their ventures they find themselves running afoul with the metal bending police, led by Toph's daughter, as well as encountering the anti-bending revolutionists known as the Equalists, led by the mysterious Amon.
There's no immediate air date announced, though it is likely that it could be sometime in 2012 given how far deep into production of the first 13 episodes they are.
The following is the complete Comic Con panel: