FifthView
Vala
Sam and Gilly at sea and the King's Moot are in book 5 and S6, and so far, are similar to the book as far as I can tell. Yeah, the rest is all new whether due to changes or simply being book 6 material.
Yeah, I'd forgotten those. I should have remembered, because those two things are an example of what I meant when I said I worried about the producers rushing the conclusion to the series. We still have to see Sam become whatever he's going to become, and we still have to see the Iron Islands story line develop. Those will probably happen throughout this season; but then it will be a quick jump to the finale season if next season is the last. (Maybe they'll do a training montage for Sam similar to what they seem to be trying with Arya, but she's already underway this season.)