For those who didnt bought the book and doesnt want to buy it but still want to know the stories from it you can see this video from Dorronsmovies that summaries this book into 3 part, only part 1 available at the time this thread created:
https://www.youtube.com/watch?v=K1-XMstgnqU
For me the book itself is well written and do pretty good job at confirming and correcting some retcon for example *Spoiler (if it's matter)* Sargeras isn't corrupted because nathrezim but because his fellow Titans mad and kinda exile him after Sargeras told them they should destroy and rebuild enitre universe to cleanse the World Soul from Old Gods so Void Lords cant be summoned into Physical Plane *End Spoiler*
What do you guys think about the book, maybe and opinion or constructive suggestion to improve the next book
PS: I'm not working for Blizzard