Well now, thanks to WinterisComing.net (and leaks from their undisclosed source), we know that the actual region of Dorne will be a big focal point in Season 5 thanks to the following characters that the show is currently casting for...
Prince Doran Martell “Doran is described as the major new player this year, appearing in multiple episodes. The fiftysomething prince uses a wheelchair, is reclusive and rules wisely. It appears the show is looking to continue the trend it started with Pedro Pascal, and cast Latino actors for the Martell clan.”
Prince Trystane Martell “Trystane, the handsome fiance of Princess Myrcella, is being aged up to 18.”
Areo Hotah “Doran’s personal bodyguard will appear throughout the season, assisting the prince with his duties. The show is particularly looking for a black actor to fill the role.”
Prince Doran, if you recall, was the Dornish royal the Lannisters were expecting to show up for Joffrey's wedding - not his brother Oberyn. Doran's gout, however, made it impossible for him to travel.
The show is also casting (and those who've read the books will know the name) for the "Sand Snakes" - i.e. Oberyn's bastard daughters.
Obara Sand “The eldest and most athletic Sand Snake will be having a major fight scene with a series regular character — not one who crosses her path in the books. This is an interesting change.”
Nymeria Sand “Nymeria is described as ‘mixed race,’ with her father being the fairer (Oberyn) and her mother being darker skinned. The second oldest of these Sand Snakes, she’s beautiful, emotional and very strong.”
Tyene Sand “The youngest of the Sand Snakes that we meet uses her wits and seductive powers and is less of a physical fighter than the other Sand Snakes. She is just as deadly as her sisters, however, but her weapon is poison.”
But Dorne isn't the only region getting some new faces...
High Sparrow “The books’ pious head of a religious movement will be appearing in several episodes in season 5.”
Septa Unella “The show is looking for a character actress to play the imposing and unrelenting septa who spends a lot of time with a major series character next year.”
Maggy the Frog “A fortune teller in A Feast for Crows, she’ll be in one episode next year.”
Lollys Stokeworth “In ‘Mockingbird,’ Bronn announced his intention to marry Lollys, whom Tyrion considers ‘dimwitted.’ It looks like the sellsword will still be around next year.”
Yezzan “A sleazy Meereenese slave owner.”
The Waif “The strange child from the books that Arya encounters will likely be played by an older actress, one in her later teens, and we understand the show is specifically looking for a woman of East Asian descent for the part.”