Near to the finale of The Legend of Korra - Book 2: Spirits when Vaatu rips Raava from Korra's body and destroys her, Korra says to Tenzen that the Avatar Cycle has too been destroyed and she is the last Avatar.
At the end Korra confirms that Raava is back inside her however her connection to the previous Avatars is still gone.
I am wondering, does this mean that the Avatar can no longer be reincarnated? or is Korra like Wan where he had no previous past lives to turn to for advice (unlike Aang who could turn to Roku, Kyoshi and those other 2 Avatars he spoke to at the end) and thus can still be reincarnated.