Over at “Not a Blog”, George R.R. Martin runs through several of the actors cast in roles related to the Vale of Arryn—Lysa Arryn, Robin Arryn, and Ser Vardis Egen. More notably, he touches on the fate of Ser Brynden Tully, the Blackfish. George explains it best, so we’ll quote him:
“... alas, his appearance has been postponed. Even with such a huge project as ours, there are budgetary constraints that require some characters to be cut, combined… or deferred to later seasons. That’s what is happening with the Blackfish. The plan, I am told, is to delay the introduction of the Tullys (Lord Hoster and Ser Edmure as well as Ser Brynden) until the second season. Brynden’s part in the events of A GAME OF THRONES will be filled in part by Ser Vardis Egen, and in part by Ser Rodrik Cassel.”
So, if the show gets a second season, we’ll be seeing the rest of the Tully clan.