We had two topics so I'm merging into one. A lot of new info has come in regarding Book 2. There is info plus concept art. Putting in spoilers. EDIT: Apparently there was too much info so I've just linked to it lol
Link for concept art: http://owldee.tumblr.com/
Link for info: http://dongbufeng.tumblr.com/post/27140645570/all-the-new-info-from-the-korra-comic-con-panel
Edited 2 total times.