Also, Tywin Lannister himself Charles Dance has seemingly confirmed that the show will be back for a fourth season. This was all but a certainty anyway of course, but HBO usually wait until the premiere of an upcoming season to officially announce the next one. Anyway, here's what he had to say..
"We're about to start season four aren't we? This year. We get scripts pretty early on, much earlier on than in similar series, usually you get perhaps one episode and you just have to trust that what's going to come in subsequent episodes is going to be as good as the one you've got, but in this I think there are six scripts already written, and we will probably be able to see them with more than adequate time to prepare before we start shooting."