Season two stuff is starting to show up, 2019 though.
I have read the book and the series isn't exactly following it. I won't say what cause it can spoil stuff. The book is a very fun read, I had it on my phone and read it casually then found myself blowing through it lol.
I am excited to see how the series takes shape because there is a lot to cover still. I felt the series rushed to this point but it may be the fault of "Hollywood" and getting to a point where people feel the show could hook you. I hope they introduce a lot of the gods!
*S* So far it has been slightly different from the book so it isn't perfectly aligned but it is following the same path. If you have questions on the book PM me, don't want to post spoilers!