I think Quan chi coming, Tsung dying in part 2, then in 3 Shao Khan says fuck it all out War Armageddon style.Quan Chi has to show up at some point. Dude is too dope a character in the game and too pivotal to certain events. I can see them doing Shao Kahn in part 2 where he tries to invade Outworld with Sindel which will require Kitana be there. Then in part 3 pull in Shinnok and Quan Chi revealing them as the players in the background pulling the strings all along.