The series will focus on Korra, a teenage female protagonist from the Southern Water Tribe and the current incarnation of the Avatar, who, according to the president of Nickelodeon, will be "hotheaded, independent, and ready to take on the world." She has already mastered the elements of Water, Earth, and Fire, but needs to master Air. The character was partly inspired by Avatar Kyoshi of the original series, whom the creators say was very popular among fans. Set at least 70 years after the defeat of Phoenix King Ozai and Princess Azula in the series finale of the original show, creators Michael Dante DiMartino and Bryan Konietzko plan to follow Korra as she learns Airbending while facing an anti-bender revolution.
In order to avoid repetition of Aang's adventures, the creators wanted to root the show in one place, called Republic City, a steam-punk style metropolis where people of all nations, benders and non-benders, live together. A concept drawing of the city, released with the announcement of the series, shows the city's design as inspired by Shanghai in the 1920s and 1930s, Hong Kong, Manhattan, and Vancouver. In the show, Korra will have to learn Airbending from master Tenzin, son of Avatar Aang and Katara, and contend with an anti-bender revolution taking place in Republic City.
The city is called United Republic and it was founded by Aang and Zuko.
The two guys in the poster with Korra are Mako (firebender) and Bolin (earthbender), and they are brothers.
The polar bear dog is female and her name is Naga.
Bolin has a pet fire ferret named Paboo.
There will be new flying bison and new lemurs.
There will be two seasons -- season 1 will have 12 episodes, season 2 will have 14 episodes.
Aang and Katara had three kids, Tenzin being the youngest and only airbender. Tenzin is voiced by JK Simmons.
Tenzin has three kids of his own.
Anti-benders use chi-blocking.
There are metalbending cops.
Toph traveled the world to teach metalbending after the war was over, and her daughter Bei Fong is the chief of police.
There will be mixed martial arts in the series, and the music was described as 1920s jazz invented by the Chinese.