As "The Legend of Korra" gets ready to have its season premiere with Book 2 this September, a host of new artwork images and the trailer have mystified fans. Although there is still a few months to go, it looks like Book 2 will expand the Korra universe with more history of the Avatar, and a glimpse into the spirit world. Here are just a few of the exciting teasers of the season to come for "The Legend of Korra."