George R.R. Martin mentions that he’s come back from a convention to some hundred new auditions tapes. He notes some of the roles actors are seeking in the tapes: Rast (one of the recruits on the Wall), Mord (brutish jailer at the Eyrie), Jhogo (one of the Dothraki warriors assigned as personal guard to Daenerys) are among the smaller parts, while Lord Tywin Lannister, Ser Barristan Selmy, and Lysa Arryn are among the larger parts.
We expect that the first casting announcements are likely to come by the end of the month, or early next month, with production set to begin in earnest right around the end of June or start of July.