The Legend of Korra's upcoming Book 3 will be called Change. According to The Wall Street Journal, Bryan Konietzko and Michael DeMartino, the creators of Avatar & Korra, released this information in a recent interview. Here's what Michael DeMartino said:

"The title of Book 3 is going to be called ‘Change.’” “It’s all about Korra dealing with the change of the world in this point in time. At the end of Book 2 she says it’s a new era. And it really is and we’re going to show how Harmonic Convergence and her battle with Unalaq and Vaatu kind of shifted the world a bit."
DeMartino also mentioned that their is no set release date as of now for Book 3. However, on the better note, he pointed out that Book 3 is already in post-production progress and is expected to take much less time to air on TV then Book 2 had taken.

[via wsj]

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