1 idea i had for KOTOR 3 is that its basically the same as KOTOR 2 but instead of tracking down the Jedi Masters (to destroy them or unite them) your tracking down Sith lords (to force them to join you or to destroy them) and each Sith lord you get to join you actually joins your party
all this leads upto your final assault on the Jedi Order (or the Sith)