As I'm sure you're aware by this point, Studio Mir will not be animating Book 2 with the exclusion of the two episodes focussing around Avatar Wan. Instead, it will be animated by Studio Pierrot, because The Boondocks and The Legend of Korra had the same animating schedule the studio had to choose, and picked The Boondocks because it's a lot easier.
However, Mir has now confirmed that they will be back on board for animating Book 3. As I don't have a facebook nor knowledge of the site I couldn't pull up the exact message but I do have a screenshot of the conversation I found online.
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