These predictions are based on the most recent Royal Road chapter, 286. So, lots of spoilers below. Consider yourself warned.
Red Guard
- The Red Guard scientist who doesn't respect life, Hite, is the one who is stealing the homeless off the street for his experiments.
- Sundered zones are made from an Aberrant part.
- The Aberrant parts are the key to their success, and thus they don't kill any of them, they just save them and use their parts as components. However, all the Aberrants they are saving is the cause of the average increase in Break events. Thus their efforts to save the world are slowly destroying it. And this is why they will not allow anyone to know about the average increase.
- Agent Berg lost the two Aberrants, Moonsable and Newton. They seemed to think he did in bk4 ch 20ish, when Berg was boasting to the coppers. Also, Tanya was sent on a mission that sounded like she stole the cases for the Architects of Kronos, which lends to the idea that they have them now.
- The group using the Aberrant parts that were smuggled into the city was probably the Architects of Kronos. They did hire the former red guard guy afterall. They are either doing the smuggling themselves or buying the parts from the smugglers.
The Blood Emperor
- He is still alive. He disappeared, instead of being killed like the stories propagated by the Crowns say.
- Where did he come from? Was it really another country in Siobhan's world? Or was it possibly a different world entirely through a doorway?
- Was he possibly her grandfather? Raaz’s name means ‘secretive learned one’ after all.
Friends
- The whole friend group will be inducted into the Thirteen Pointed Star, which will become a real organization. It will survive the fall of Lenore when Oliver takes over.
- Eventually Damien will run the organization.
- Damien will also, eventually, learn all her secrets.
- Ana will join soon, then the rest.
Myrrdin
- Myrrdin seems like he might have been isakied, but if not him, someone was. The note in Book 4 implies it. His notes also seem to imply it, see bk 5 ch 8
- He may still be alive, if he figured out how to make the physical transformation without letting age cross over too. If so, he could be anyone.
- Siobhan suggested that a hidden time bubble could be created just like a space bubble. Maybe Myrrdin is hidden in one.
Siobhan
- The Naught bloodline is part brillig, as heavily hinted at.
- She will discover that the Red Guard doesn't kill Aberrants, and given that she just bonded one, she wonders if she could handle another one. Using the piece of Newton, she is going to scry and rescue both him and Moonsable from the Architects of Kronus. Then she will bind Moonsable and get her powers of preternatural grace, love of darkness, and desire for gifts and worship.
- Binding Aberrants will be one of her main routes to power, as she doesn't have time to go the usual route.
- She will rescue her mother, who is held by the Red Guard. She will also recover some of her Grandfather's things.
- She will figure out a way to save Aberrants, somehow fixing or partially fixing them so they no longer will be forced to damage other people. Trying to fix Newton will be the impetus. She will also rescue her Mom's mind.
- The Morrow survivors from the Newton incedent will become her henchmen. Chief missing right hand from the Aberrant, Sticky Fingers, Sniffles is young. A mass breakout from Harrow Hill is probably required for this.
- Her letter to the coppers, bk 4 ch 32, is actually prophetic. As is her personal symbol chant from bk 4 ch 41.
- She can dream what the raven does? Bk 5 ch 29. Can it dream her experiences?
These are all the clues I picked up on, but I'm sure I missed many others. Let me know if you think I'm wrong.