Season 4 of The Legend of Korra is called Book 4: Balance, and the season premiere is on October 3, 2014.
Season 1 of The Legend of Korra was called Book 1: Air and the season premiere was on April 14, 2012.
The third season of The Legend of Korra (Book Three: Change) premieres on June 27, 2014.
Season 2 of The Legend of Korra was called Book 2: Spirits and the release date was September 13, 2013.
The season premiere of Book 4: Balance of The Legend of Korra will premiere on October 3, 2014.
The second season aired on September 13, 2013.
Yes, there are going to be 4 seasons and a total of 52 episodes. Season 4 will be the last season of The Legend of Korra, which will probably premiere sometime in 2015.
Legend of korra season 3 is going to be called "Change".
No, Book 4: Balance is the last season of The Legend of Korra.
Yes, Mako and Korra will be together in Season 2.
The title of Legend of Korra season 3 is called "Change".The Legend of Korra will remain focused on constant elements of human experience.
It has not been announced whether the Avatar series will continue after The Legend of Korra. If a sequel does get planned, it probably would not get announced until The Legend of Korra ends which will be sometime in 2015 after season 4 ends.
The season finale of the Legend of Korra, Book Three: Change, premiered on August 22, 2014.