I'm sure Monk will be my main character just when thay released information of him. But... It will be female monk. Why? Becouse she has white hair. I love white hairs in game characters so the choice is make. And of course gameplay also looks enjoyable. Ah, and I like word 'Serenity'.
Don't think just about necessery lore. For me Kingdom of Shadow was one of the best books I have ever read so You should definietly check it. Good plot, nice characters and the whole mistery of the city are the main reasons.
And the city itself will be in Diablo 3 I think so it's even better to read the book.