BEFORE YOU READ: This is just speculation, none of this stuff has actually been confirmed or datamined, this is all just putting together hidden pieces of the puzzle to figure out what the Cabal DLC may be about. The most likely one, if you think about it, will be the Cabal's Emperor himself. It's pretty obvious considering Oryx was like the ultimate Hive, Crota the prince, Skolas like the soon-to-be leader of all Fallen (if he wasn't stopped), Atheon was like the bender of time and high rank of the Vex, so I think you get the point. When you kill the Shield Brothers, Cayde-6 mentions something about them being the last ranking officers in the Solar System, so I wouldn't be surprised if the Cabal Emperor is pretty pissed and goes with his highest ranking soldiers to attack the Guardians. Also that area you can glitch into by flying in with the sparrow and fist of havoc looks like somewhere that will be used for the Strike(s), or even the raid! If you guys have figured out anything else that could link to 'Forge of Gods', don't worry to post it here. Hopefully together everyone could break down a lot of things.