Is each book in this series a focus on a particular character? Did I read that somewhere?
Each one has a flashback sequence dedicated to a certain character, and a plot that has something to do with the flashback sequence. I do this to help differentiate them, and we sometimes call it "their" book--but that's a little of a misnomer, as the main plot may not revolve around the flashback sequence. It will simply relate to it.
Ah right. It was Kaladin then Shallan, next is Dalinar? Or is it Szeth?
This one is Dalinar most likely. Then (probably) Eshonai, then Szeth. Unless I swap those two.
Back five are Lift, Renarin, Ash, Taln, Jasnah. Not necessarily in that order. (Though that is the planned order right now.)
I do have to give my standard disclaimer. Someone getting a flashback sequence does not indicate they survive until that book. I'm fully willing to flashback to a character who died in an earlier volume. So that isn't as much of a spoiler as it seems.
And Taln is defined as "The man who thinks of himself as the Herald Taln, and whose viewpoint we got briefly in Words of Radiance."