As somebody who has been known to complain when movie and TV adaptations diverge from source material in major ways, I’m looking forward to see how the third season and the third book compare.
Given that it’s been more than ten months since we last saw new episodes, I’ll take pretty much anything at this point.
We do already know a few differences from the books, including a look at the Battle of Culloden that we didn’t see on the page.
That said, the changes may be as simple as filling in some of the blanks that weren’t covered in any of the novels.