My predictions are
Korra will go into the avatar state RIGHT BEFORE Amon puts his finger on her forehead to take away her bending
Asami's father will come back and she will choose him over the group.
Katara will come out of hiding to help her son out (Tenzin's gonna get his ass BEAT)
Zuko will arrive in republic city by boat

(random)
Korra will talk to Aang in the Spirit world.
if Korra doesn't go into Avatar State in the season finale

I don't know what to say lmao