Yeah, they condensed or combined some of the plot points for book 3 into this season. And based on how the season ended, there's a lot of stuff from book 3 that got cut. I'm going to guess that season 3 will be entirely book 4. Again, I see the showrunners cutting a lot of stuff. Mostly because prior character development has been cut or completely ignored. Not to mention entire cities, major objects of power, etc etc.