They certainly got this one out faster then the wait from Book 1 to Book 2. Its time to get the Korra hype started again on bnet!
I think with the trailer released we can expect a August or September release date.
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Did Azula have an equally crazy daughter with an equally crazy daughter? And I'm gonna guess that the city they're at is Ba Sing Se (Dai Lee agent), or a White Lotus city (the shape of the walls).