Straight from HBO, we learn that they’ll be airing a “In Production featurette for season 3 at 8:54 PM Eastern, prior to the finale of Boardwalk Empire. According to HBO:
The piece will be a first-look at new characters from Game of Thrones’ third season and will feature interviews with the creators, cast and more.
After it debuts on the air, it should show up shortly after at the usual spots—HBO, Making Game of Thrones, and Youtube.
Particularly interested in seeing Diana Rigg as the Queen of Thorns and Kristofer Hivju as Tormund Giantsbane, for my part.