According to this tweet by actor Oliver Powell (who has previously auditioned for a role, and has mentioned that Westeros.org was one of his resources when researching the role!), the roles of Syrio Forel and Rast (a recruit to the Night’s Watch) have now been filled.
According to Powell, Syrio is played by Miltos Yerolemou, who has appeared in a number of television productions. Searching the internet, Yerolemou has also had a number of theatrical roles, including the role of Feste in a Royal Shakespeare Company production of Twelfth Night. Yerolemou confirmed his casting to us when contacted via Twitter, and the part can be seen in his Spotlight CV. Also via Twitter, he tells us that he’d be quite surprised if he were not rendered bald (either by shaving his amazingly curly head of hair, or through prosthetics) for the part, for those who are wondering about the visual fidelity of the series to the novels.
Here’s a fine portrait of the actor, via Flickr:
Perhaps more interestingly, however, we have a Youtube showreel. About 3 minutes in we get past the montage to some selected scenes from theatrical and television roles:
Luke McEwan is a recent Oxford School of Drama graduate, who has received a good deal of praise in the role of Cymbeline in the eponymous play by Shakespeare, for the National Youth Theatre. Rast is one of the less savory of the Night’s Watch recruits that Jon Snow meets early in A Game of Thrones.
As to the third role? EwaSR has shared via Twitter that an acquaintance of hers has landed a role in Game of Thrones. Not as Joffrey—the role he auditioned for, apparently—but for another Lannister part. At a guess, this will be our Lancel Lannister, but we’re waiting on confirmation.