This one just dropped today, and it's an interesting one in terms of casting rumors. The thread for season 4 started with a casting rumor that included the return of Michelle Fairley, which turned out not to be true, but the New Zealand Herald reports that Keisha Castle-Hughes, an Oscar Nominee (for a role she played when she was 13), has been cast as one of the Sand Snakes. Vanity Fair thinks it's Obara.
The interesting bit is this:
NZ Herald said:
This page says her handle was @kecahu and her "name" was "kemamo STARK". I know it's possible that she is just a fan of the show and likes the Starks or something, but I have to wonder if she wasn't in fact cast as Lyanna Stark.
Bran is already essentially caught up with ADWD, so a good way to avoid taking his plotline past where GRRM has gone in the books is to fill in show-watchers on all that backstory they've been missing. Bran is the perfect vehicle for that backstory, better than any opportunity they have had so far, and I wouldn't be surprised if they had been planning this all along.
I think it's possible that the NZ Herald jumped to the conclusion that she would play one of the Sand Snakes because she is of mixed race, English father and Maori mother, and we know that's the kind of thing they were looking for in the Sand Snakes (they were looking for a black woman for Obara), but they are continuing the Hispanic trend for Dorne, and after looking through Google Images, it would seem Castle-Hughes can 'pass for white', as we say in the Deep South, and if one is looking for someone to play Kit Harington's mother, someone dark enough to balance Targaryen blood and make the show's Jon Snow, she's the gal. She's actually fairly light-skinned, but so is Jon, and his hair has its own contract.
What do you guys think?