Yup, that's definitely a good one of Arianne. I'd be extremely disappointed if they skip out on Dorne in the show.
As far as your comment about the Ironborn, I somewhat agree, although I did kind of feel the same way when reading ACoK as well. It wasn't until AFfC that I became truly interested in them. So hopefully the show doesn't skimp out on them either. Although I'm already worried that we may miss the Kingsmoot, since Yara already has plans to go rescue Theon. I don't remember anything like that happening in the book.