Considering how much everyone on Kotaku loves Game of Thrones, I'm super surprised this cool 15 minute documentary, focusing on the upcoming season 4, hasn't been on the site yet. But here it is! You should totally watch it!
It's a great balance between teasing, substance and foreshadowing. You won't get any real spoilers from it, but folks who have read the book will be able to act all smug and go, "oooooh, I know what they're referring to there".
So for all fans of Game of Thrones, it's definitely worth watching.