Team Avatar will travel to the Southern Water Tribe. They'll visit a festival with glowing lanterns that warm up the snowscape scenery. Beautiful.
Korra will travel through a storm to find a glowing iceberg. Spirit world? The ice cave looks very reminiscent to the iceberg Aang was trapped in.
We saw concept art of the Southern Air Temple. Inspired by Chinese art, it's a stone structure enhanced with yellow and orange skies, lush vegetation growing over it.
Book 2 will explore the Spirit World and how the "Avatar" lineage began. Korra will travel into the spirit world and Konietzko hints that there may be episodes later in the season dedicated to exploring the bigger landscape of the Spirit World.
Then we saw some new costumes. Korra will have new threads inspired by Mandarin, asymmetrical fashion. Mako and Bolin will get big, fluffy coats for the frozen tundra that maintain their color coordination (Mako loves that red scarf).
Asami is now the head of her dad's Future Industries, so she's gone corporate! Luckily, she has an alternate costume, an airship look that makes her a double for Amelia Earhart.
Book 2 will bump up Bumi, a fan favorite and brother of Tenzin, to a regular character. He's got a big potbelly which fits his wacky personality.
His sister Kya will also be a regular player. Dubbed a hippie by "Konietzko," Kya's big into healing.
Korra's expanded family will be introduced. The creators mentioned that Korra was inspired by MMA fighter Gina Carano, which explains her build. It also explains why her entire family is ripped. Modo fuente
Book 2 called "Spirits" and takes place six months after Book 1.