Crazy shit just about to go down! This Sunday night at 9am (didn't that week off feel like a really long wait).
Hopes/predictions for the episode?
As per wiki:
"The Rains of Castamere" was written by executive producers David Benioff and D. B. Weiss, based on George R. R. Martin's original work from his novel A Storm of Swords. The material adapted in the episode include chapters 41 to 43 and 50 to 53 (Bran III, Jon V, Daenerys IV, Catelyn VI, Arya X, Catelyn VII, and Arya XI). According to Benioff, this episode contains a particularly memorable scene from A Storm of Swords, the prospect of filming which was part of their motivation to adapt the novels for television in the first place.[2]
Also, click the link for some Season 4 news.