Here's what i think should happen the KOTOR3 game.You should start out on some sith world in the unknown regions,in a prison(light side), or as a sith lord(dark side) as Revan.Light side- you have to break out of the prison and find a ship to fly you out to a world with the jedi(as the jedi have regrouped since KOTOR2).Dark side- you tell your army that you are leaving to the core worlds alone.You go to a planet with jedi.In there temple you should kill a few jedi.Both- then you go to the council chambers to either warn them(light side), or threten them(dark side).
Then the story shifts to the true main character, a young apprintice.You now permanantly take on this role. You start out with some training at first.Some things will happen(not realy sure
). Then you start out again as the same character, but your older.Then you get sent on a quest with your master to find revan, and either kill him or bring him back.
PS:There should be a way to choose a tottaly costamized voice talk for your character.