I think a good portion of Book 4 is going to have to deal with the fallout from Dalinar's Memoir. What do you think the implications are going to be regarding the Kholin family? As far as we know, both Adolin and Renarin only know the public version of what happened at the Rift. Once the memoir goes out, they're going to find out how their mother really died. Both boys idealize their father, Adolin in particular. I can't imagine this is going to go over well. Where do you think this knowledge is going to take the Kholin boys in their individual stories?
Second is, how is the Ardentia is going to react to the Memoir? Personally, I think the Ardentia would try for a power play with or without the Memoir, but now they have an excuse. The foreshadowing about the Hierocracy was about as subtle as a sledgehammer by book 3. But Dalinar's memoir itself - being written by Dalinar's own hand - is a direct defiance to Vorin culture and it's a serious threat to the subtle power structure the Ardentia has maintained.
So I think that the Ardentia is going to start making some drastic moves, and Kadash is going to be stuck in the middle of it all. In Book 4, I predict that Kadash is going to become one of the more realmatically aware characters in the story, and he's going be responsible for finding out who (or what) is pulling the strings within the Ardentia. He may even end up being Radiant or at least a squire to one by the end. A part of me would really like to see how a direct confrontation between Kadash and the Nightwatcher would turn out, though I can see him attracting an Inkspren too. Thoughts?