Nothing, the kings are planning nothing. Seriously, we beat the vex, we beat the hive, we beat skolas (in all honesty it doesn't make sense since crota and the vex should have been infinitly more powerful than skolas) and then we beat Oryx. Seriously, by any means of comparison at this point we are the superpower of the galaxy, if at lest not the solar system. Splicers and SIVA was a joke, but whatever. Anything going foreword in destiny needs to introduce some sort of new superpower for us to fight, the fallen at this point are nothing, I still believe Oryx was the pinnacle of powerful enemies. Nothing else at this point really compares. If anything D2 should bring the fallen into an alliance with us because we could/should be able to absolutely crush them and exterminate their race at any point we choose to. Cabal? Meh.... If anything I think it's a little ridiculous how they created the story and the game, year one we should have been fighting fallen and cabal, massive campaigns and wars and story with them. The Hive, Taken, and Vex shouldn't have even been introduced yet (maybe a little hive or vex here or there to scare us or something, maybe seeing lost stories or hints to them) but we should have beaten the fallen and cabal first, established a universe, a large story, and then game changers like the vex could show up, then hive, then taken. Progressively fighting stronger and more powerful enemies. Building up the lore. Bungo made a huge mistake by having us essentially destory the Vex in what, 15 missions? Destroy the Hive in no time. These guys are the biggest and baddest bosses out there. Atheon, Crota, Oryx, should have only been spoken or teased about. And bungo shot themselves in the foot by trying to convince us that after killing these three (if not even the first two) anything else should provide a challenge in comparison to these gods.