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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So, Zuko, Earth Kingdom, and bending change-ups? Meh, I still like the Last Airbender better. They need to get a single story arc for the next Avatar.