legend of korra book 2 promo poster and episode titles
The confirmed first 4 episode titles of Book 2 of Legend of Korra were released. Courtesy to an online television sourcing site called TheFutonCritic, we now have a better idea (sort-of) of what to expect in September.

Air Date Episode Title Premiere Time
Friday: September 13 2013 Rebel Spirit 7:00 PM
Friday: September 13 2013 The Southern Lights 7:30 PM
Friday: September 20 2013 Civil Wars Part 1 7:00 PM
Friday: September 27 2013 Civil Wars Part 2 7:00 PM

Notice how the 3rd and 4th episodes are called Civil Wars. That definetly foreshadows some interesting action to come.