The show was picked up for 2 more books, making a total of 4.
Thanks to S34n05 who posted the link in the other thread. Here's some of what was discussed for Book 2-
-BOOK 2 IS NAMED “Spirits and will take place 6 months after the end Of Book 1
-They are showing artwork from Book 2, including snowy landscapes of the Southern Water Tribe during a festival, including a big hall made of Ice.
-They will travel into the SWT Tundra, with bright green sky.
-They will encounter a glowing iceberg similar to Aang’s from 101
-They will travel back to the Southern Air Temple in Book 2
-We will get spirit world action, Book 2 will explore the history of the Avatar (creation of the avatar) and The Spirit World. 2 special episodes devoted to this (I think)
-Asami will take over Future Industries and Bumi and Kya will be main characters
-We will meet Korra’s uncle Unarock (not sure if this is the correct spelling, just what someone posted) supposedly all of Korras family is BA, lol
Kya is a bit of a bippy, has a special bond with Jinora.
-We will see more of Korra’s parents, Tonraq and Senna, including flashbacks of Tonraq in his 20′s…..Shirtless, Unarok is his brother, who is posh, from the NWT. More on North Vs South issue. He has twins.
-They show a spirit who is spiny and evil looking.
-Pro Bending will return, they show an Animatic of The Fire Ferrets Vs The Lion Elephants.
-Korra is racing Jinora in Airball and uses the Avatar State to beat her which annoys Tenzin, animatic I think.
-Motorcycle chase with Mako and Korra chasing some robbers.Storyboards.
-Mako becomes a cop in Book 2 !!!
-The Fire Ferrets now consist of Bolin and 2 new teammates, which I assume makes Bolin the Captain. Playing with new players the team is losing.
-Korra is attacked by a spirit and pinned down and uses the Avatar state to free herself. Storyboards
-Bolin looking for his path in life.
-Tonraq’s brother mentioned above is more in touch with the spirits and helps Korra with the Avatar State he is the head of the NWT, Chief I assume
-Bolin is friends with a guy named Verick and they have a funny relationship, as Verick is a ladies man.http://avatarthelastairbenderonline.com/sdcc-2012-korra-panel-information/