I could not wait more to read this Stormlight Archive book, so I started it and enjoyed it.
Kaladin is depressed and is dismissed from service, just after bringing his family to Urithiru.
Shallan is struggling with her memories and seems to be growing a new personallity.
Perhaps Navani is the main character in this book, as she becomes a dedicated scholar after being retained in Urithiru in the Singer's invasion of the Tower.
We know more about Venli's history and how she tries to save the last Listeners.
Wit (Hoyd) becomes an important character for the first time in the Cosmere's books, after being present but in most of the books.