This post has all the updates we've received so far from The Legend of Korra's Book 2. This post is subjected to changes as we receive new updates. So make sure that you stay updated

• 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. 
• Bumi wears Pink earmuffs. 
• The characters will all have updated winter looks for the Water Tribe. 
• 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. 

• Kya is a bit of a bippy, has a special bond with Jinora. 
• Bolin will wear a green parka. 
• Mako will have a coat. 
• 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. 

• They are recording the crowd in the panel for use in probending crowd scenes in Book 2. 
• For Book 2 Bryan is focusing more on design and more writers have come in to help Mike, so basically work is being done on 2,3 and 4 as we speak in some form or other. 

• Kya is really into healing.

A secret trap door at the Southern Air Temple

Asami’s new outfit for Book 2

Asami’s other new look, Amelia Earhart inspired.

Bolin’s new outfit for Book 2

Bumi with his pink earmuffs

Korra’s new outfit for Book 2

Korra’s Uncle, Unolok’s facial expressions.

Mako’s new outfit design for Book 2

Kya, Tenzin’s sister

Senna, Korra’s mother

Concept Art of the Spirit World

Tenzin’s Book 2 look

The daughter’s facial expressions

Tonraq, Korra’s father

Unolok’s daughter

Unolok’s son, he has a twin sister. Korra’s cousin.

Verick a SWT captain of industry guy, who is a bit of a ladies man and has an odd relationship with Bolin.

The various faces of the eccentric Verrick

Deeper in the spiritual energy source

Festival Banquet Hall

Icy Tundra

Korra’s Uncle, Tonraq’s brother the leader (chief) of the Northern Water Tribe, Unarock

Southern Air Temple

Southern Water Tribe festival concept art

A spirit from Book 2, they appear to be the villians of the season. Not sure though

Spiritual Energy Source.

As storm approaches Korra and friends get trapped in.

A younger Tonraq, not sure

The various faces of Bumi

Sources : avatarthelastairbenderonline.com
              wikipedia.com