As we all know today was SDCC 2012, and Bryke has released a bunch of information on season 2! I'm not so good at summarizing things, so I'll just make a list of everything we learned.
- Book 2 is called Spirits
- Book 2 takes place six months after Book 1: Air
- The Book begins with a festival in the Southern Water Tribe
- The Southern Water Tribe has been rebuilt just like the Northern One
- Each member the group gets polar outfits.
- The Southern Air Temple and other ancient Air Temple sites WILL be visited.
- Asami has taken over Future Industries, and has a business outfit
- More info on Kya, whose favorite song is "Secret Tunnel". She's a bit of a hippie and has a special bond with Jinora
- Kya and Bumi also get winter garb.
- We will meet Unalaq, Korra's uncle, who is the Chief of the Northern Water Tribe.
- We will meet Unalaq's twins, a boy and a girl.
- We'll find out more about Korra's family, and about the history of the different tribes.
- There's no shortage of spirits this season.
- Mako becomes a cop.
- The Pro-bending crowds are the voices of the people at the Korra panel in SDCC 2012
- Bolin will get a love interest, and has a bizarre love story.
- Unlike Mako and Korra, Bolin still plays for the Fire Ferrets' pro-bending team
- We will meet Verick, a captain industry residing in the Southern Water Tribe and a friend of Bolin's.
- The voice actor of Azula confirmed that she will be returning to voice a character called "The Dark Spirit" (Thanks and 188.8.131.52!)
Images from Coimc-Con:
(New Korra Outfit)— Korra
(New Mako)— Mako
(New Bolin)— Bolin
(New Tenzin)— Tenzin
(Spirit World)— Spirit World
The Entire LoK SDCC 2012 Panel
 (Part 1 of the 4 part playlist)
 (A sort of "Where are they now" vid. Bolin is the leader of the Fire Ferrets, Korra is still training, Mako is a cop and Asami is leading future industries)
 (Legend of Korra table read)
 (Interview with the creators and Team Avatar's voice actors)
 (The Korra cast answers fan questions)
 (Released character art + commentary from Bryke)
 (nterview with PJ Byrne, voice of Bolin)
NOTE: This blog WILL be updated as time moves along. Also, please add links to images or videos not included; it'd be very appreciated.
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