"Change" was the name of the third season. The fourth season will be named "Balance". The new season will premier on Nick.com on October 3rd! The show is no longer televised but it will be available on Nickelodeon. There's even a preview
here.
And I do ship Korrasami
I loved her and Mako together... but it was toxic. Ungh. I think this season will be about her learning to "balance" her handicap, what happened to her, and coming to better terms with the loss of the other avatars.