With HBO green-lighting the third season, it's time to have a thread for all the news, casting, videos, and pre-season discussions on it.
Season 3 will premiere on Sunday, March 31, 2013!
Here's a partial list of new roles introduced in season 3 (I'll add their actors when they are confirmed).
-Mance Rayder (Ciaran Hinds); the self-styled King-Beyond-the-Wall; a runaway from the Night's Watch
-Meera Reed (Ellie Kendrick); a teenage girl from Greywater Watch; the oldest child of Howland Reed, Ned Stark's old friend and war companion
-Jojen Reed (Thomas Brodie-Sangster); Meera's younger brother; a greenseer
-Daario Naharis (Ed Skrein); a Tyroshi mercenary; captain of the Stormcrows, a mercenary company in Essos
-Edmure Tully (Tobias Menzies); Catelyn's younger brother and heir to Riverrun, the seat of the ruler of the Riverlands
-Ser Brynden "The Blackfish" Tully (Clive Russell); Catelyn's uncle; a famous knight
-Lady Selyse Baratheon née Florent (Tara Fitzgerald); Stannis' wife
-Shireen Baratheon (Kerry Ingram); Stannis and Selyse's only child; a young girl
-Olenna "The Queen of Thorns" Tyrell née Redwyne (Diana Rigg); Margaery and Loras Tyrell's grandmother; the mother of Mace Tyrell, the Warden of the South; a very old woman
-Lord Beric Dondarrion (Richard Dormer); sent to the Riverlands by Ned Stark to arrest Ser Gregor in season 1; the leader of the Brotherhood Without Banners
-Thoros (Paul Kaye); a red priest of R'hllor originally from the Free City of Myr in Essos but has lived in Westeros for a long time; famous for fighting with a burning sword; Lord Beric's second-in-command
-Tormund Giantsbane (Kristofer Hivju); a famous wildling raider
-Vargo "The Goat" Hoat; a mercenary originally from the Free City of Qohor in Essos but currently resides in Westeros; leader of the notorious mercenary company the Brave Companions also known as the Bloody Mummers
-Ramsay Snow (Iwan Rheon); the bastard son of Roose Bolton, the lord of the Dreadfort; ordered by Robb Stark to retake Winterfell in season 2
-Orell (Mackenzie Crook), a wildling raider and skinchanger under Mance Rayder
-Missandei (Nathalie Emmanuel), a young slave girl from Naath who works as an interpreter in Astapor, Essos
-Qyburn (Anton Lesser), an ex-maester of the Citadel who is a member of the mercenary company Brave Companions
-Anguy (Philip McGinley), a young, skilled archer from the Dornish Marshes known as "The Archer"
-Grey Worm (Jacob Anderson), a captain of the Unsullied, elite eunuch slave soldiers trained and sold in Astapor, Essos
-Kraznys mo Nakloz (Dan Hildebrand), a rich slaver from Astapor dealing mainly with Unsullied
-Prendahl na Ghezn (Ramon Tikaram), a Ghiscari captain of the mercenary company Stormcrows located in Essos
I'll update this as more news comes along.
Edited 5 total times.