Spoiler for Book 2
Yes, there willl be a third season due out sometime this fall, season four is just about finished in production. The third will deal with spirits in the day to day lives of humans once again, we all know how well Wan handled that situation. So spirits wanting land once again for themselves and causing problems...etc Korra having to deal with this on her own because when Rava was removed from Korra and attacked in her natural form it weakened and cut the connection with all previous Avatars, so no direct phone line to them anymore. (Just a guess on the following) So she may have to visit older places around the world in order to gain an understanding of how to help 'balance' things out. Spoilers Zuko and his dragon are gonna possible be of some help, White Lotas could be the bad guys....
On that subject I would like to add a personal thought,
Thanks to the Tree when she recovers her memory, Korra still has all the memories of the past Avatars so this means that while all the other Avatars have been reincarnated (until they show otherwise I'm going with that) as Rava no longer holds their souls/spirits with her connection. Korra can still have the Power/Knowledge...etc when she enters the Avatar State, like an Avatar 2.0.
The tree when she recovers her memories, including those of the past Avatars, got compressed into a "human zip file" thus allowing her to still have access when she needs them.
Edit : If this seems redundant, I do apologize, it's been a long 32 hour day.
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