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George R.R. Martin has confirmed all four guesses that we’ve listed (with added Youtube videos featuring performances): Lalor Roddy as “Assassin”, Simon Lowe as “Wineseller”, Mark Lewis Jones as Shagga, and Clive Mantle as the Greatjon. He also adds a fifth name to the mix, Susie Kelley, cast in the role of innkeeper Masha Heddle.
He’s taking off for Australia and the Worldcon there on Monday, so does not expect he’ll be providing updates for when other roles—he lists Ser Ilyn Payne, Prince Tommen, Princess Myrcella, Rickon Stark, Mirri Maz Duur, “and more”—are cast and can be announced.