You can just listen to Chris Metzen read these out for free on Youtube, they’re like less than ~20 mins each. You don’t have to buy a whole separate book and miss out on any important story this time.
I’m listening to them while just doing stuff in game, very cozy. 
Thank you Blizzard for not hiding important expansion story in separate novels this time and making sure it’s all right in front of us and accessible 
They’ve put out a number of short audio books over the years. It’s very cool. I think this is the first time Metzen has done the reading though.
Does jaina eat a pickle or no?
https://i.imgur.com/5QR0eJS.png
What? She may like big pickles.
It’s a little silly when he does his regular voice narrating and then goes into the Thrall voice for Thrall dialogue lol. I was like “oh no is he gonna try to voice Jaina too?” but thankfully he did not.
I would have loved it more if he did. That would be awesome lol