Given past spoiler-rule agreement issues in the seasons 1 and 2 threads, we've got a separate thread for S3. Before reading this thread, please ensure that you've seen all of seasons 1 and 2 or that you don't mind having seasons 1/2 events spoiled. Once season 3 premieres, episodes that have aired will also be fair game to be spoiled.
If you've read the books and plan to post a comment that gives away something that has not yet been aired on the television show, please use spoiler tags and additionally please mark the spoiler as spoiling future books/seasons so that it's obvious to those what they're clicking through to.
Winter Is Coming reports on an EW scoop confirming some much-hoped-for Season 3 castings, including: (not really anything specifically spoilerific, but I tagged it in case anyone's particularly trying to avoid anything that hasn't been mentioned in the show already)
– Daario Naharis: A confident and seductive warrior.
– Jojen Reed; Meera Reed: A teenage brother and sister duo with special insights.
– Edmure Tully: A brash young member of the Tully family.
– Ser Brynden Tully (The Blackfish): Catelyn Stark’s uncle.
– Lady Selyse Florent: Stannis Baratheon’s wife.
– Shireen: Stannis’ daughter.
– Olenna Redwyne (The Queen of Thorns): Margaery Tyrell’s sharp-witted grandmother.
– Beric Dondarrion: A skilled knight who is the leader of the outlaw group Brotherhood Without Banners.
– Thoros of Myr: A red priest who follows the same religion as Melisandre.
– Tormund Giantsbane: A Wildling raider.