I feel like some japanese family betrayal is going to happen and the brother will release all of the elder archons from the first darkness war and have them kill you. I think the queen will flee to the tower permanently as well, making the iron banner area above the vanguards permanently unlocked. With that, I feel content will eventually spill out into the tower with the now permanent opening of that part of the tower. For the raid, they should make it feel like a civil war over there, for example, for one boss you should have to kill a prisoner archon without that archon killing a person from your fireteam. If someone dies, he will absorb the dead players light and use it against you, killing the rest of the fireteam, unless you can take out the archon's two sidekick high servitors as they approach the dead players ghost. Theres a good chance they might not do something like this but it would be kind of cool, that brother the queen has is a -blam!- anyways. I have good ideas for him lol.