I wonder how they're going to handle unveiling of the Prophet. My money is still on Brian, but so many things make him obvious candidate by now it does seem a little like a red herring... well, if he is, they better have a damn good explanation for Saga's drawing of him and the prologue in Dreamfall.
Zoe might have been dreaming, but I refuse to believe Propast was only a dream. Too much time spent there, too much story put into it. While it's curious that those "internal" decisions seem to be of a major importance for the game (do we want to regain memories, what are we looking for etc.), I think Propast does exist, it is in Stark, and Zoe did live there. Possibly while still dreaming in Casablanca.
To my mind it goes like this: Zoe's soul can travel in a material form, though it might be sensed by some she's not completely there. In Dreamfall, she was in Stark all the time, but her soul sometimes travelled to Winter and to Arcadia. In Chapters, she is precisely in one place all the time - Stark, Casablanca - but her embodied soul roams both Stark and Arcadia. Notice how her body disappears from Mira's warehouse in Book Three. She wasn't completely there. Otherwise her body would remain, as it remained in Dreamfall. But it doesn't mean the place didn't exist, just the same as her dreaming herself to Marcuria didn't mean Marcuria doesn't exist. It's the whole out of body experience thing. You don't need to cross the Divide for it to take place.
Chapter 12 - Zoe and Kian, Zoe in both Stark (Casablanca or Mumbai) and Arcadia, Kian in Arcadia,
Chapter 13 - Kian and Zoe.Arcadia. Tower ceremony. Prophet revealed. Kian vs Vamon. Zoe in Storytime.
I think this one is pretty much on spot. Possibly with an interlude in between, with Saga leaving her house and going to one of the worlds. 90% meeting her uncle, who I dare to dream is Cortez. I also think Book Five might start with Tower ceremony, and the confrontation of Kian and Prophet (which is going to be this one's final confrontation, IMO, with Vamon being simply a henchman) will take place in the second chunk of Kian's story.