I finished reading it today. Couldn't put it down, and can't wait to see where the series goes next. Spoiler filled ramblings.
It felt more like Navani's book than Venli's. Navani's arc was really satisfying, and Raboniel was a more interesting character than I first expected her to be. Bonding the Sibling and repelling Moash was a great moment.
Kaladin's fourth ideal was what I long suspected it would be. It is nice to see him get there, and develop a more mutually supportive relationship with Syl. Teft's death along with his spren was heartbreaking. I had previously been interested in a Moash redemption arc, but not anymore.
Restares is Kalak, and Thaidakar is pretty much confirmed as Kelsier. Didn't really see that coming. The Ghostbloods are potentially responsible for delivering Ulim to Venli - that woman is likely Terris and was potentially compromised by the other Terrisman who Mraize clashed with. Lift's got that chicken/Aviar now which should be fun. Adolin and Shallan have finally declared war on the Ghostbloods.
The Recreance was a joint decision between spren and the radiants. There weren't any deadeyes prior to this. Seems like the imprisonment of Ba-Ado-Mishram is intertwined with this and the Sibling's slumber. I'd like to see more on this. Kalak seems convinced it was a bad idea to imprison her, but it's hard to imagine him taking much action in his current state. The only thing he is sure about is that he wants out. We were given some hope that Jezrien may be trapped within the gem, but Kalak is certain he has faded. It's amusing that the other Heralds consider Ishar the sane one. Those experiments were twisted.
Taravangian's Ascension is terrifying. I wasn't expecting Nightblood to meet Odium in this book. Cultivation and Renarin bet on him so I assume Renarin must have seen a benefit to that path. Cultivation is harder to judge. Her vessel is heavily implied to be dragon. Harmony states that In truth, it would be a combination of a Vessels craftiness and the powers intent that we should fear most.. I'm looking forward to how he will twist the terms of the contract to his benefit.
Wit losing his memories at the end is awful. Storing memories in his Breath is how he's maintained his sanity. He appears to have lost his perfect pitch so he likely has lost a significant amount of Breath, or perhaps had them corrupted in some way.
I was hoping to see Zahel make a reappearance after his chat with Kaladin, but that was never touched on. I guess he traveled with Dalinar or hung low during the invasion. Still waiting to see more from Taln as well. The Stormfather confirmed him as the best fighter. Not a surprise, considering he is the Herald of War.