It seems a number of the actors who are confirmed or suspected to be cast—Jennifer Ehle, Esmé Bianco whose role as “Ros” (formerly “Red Headed Whore”) GRRM has confirmed in e-mail, and Jamie Campbell Bower who many believe is playing Waymar Royce—are travelling to Belfast in connection to the production. In fact, Campbell Bower has already returned from Belfast, indicating he had a “good readthrough” in a tweet. This suggests that much of the activity has to do with preliminary read-throughs of the pilot script by the various members of the cast, and possibly other production-related activities such as costume fittings.