They lose Republic City. Amon is not defeated, or is revealed to be a puppet in an even bigger plot. Either General Iroh or Asami dies (optional, but someone has to die). Korra finally enters her Avatar state in order to parallel the original series, but instead of water, it’s fire she destroys everything with, hurting one of her friends, possibly even causing the aforementioned death. Asami has a showdown with her dad. Amon and Korra will start to face off, but will get interupped. (Someone’s honor will get hurt) And of course, the one constant, Meelo (and the other air bender kids, but mostly Meelo) will be a bad ass.