I saw that elsewhere today. I didn't initially like the Dorne storyline but now that I'm re-reading the books, I like it better - I've just passed the Red Viper's arrival at King's Landing. The machinations which Oberyn has regarding marrying his offpsring to surviving Targarean children are quite interesting.
Very sad. My father-in-law died from cancer in that region. As with Patrick Swayze and Brian Lenihan, former Irish finance minister, cancer in that area is basically unsurvivable, as far as I can see.