Update: The HD version has been released, we've updated the post.
This is the trailer that ran at the IMAX screenings of Game of Thrones, and at least one theater-goer was brave enough to grab a bootleg copy. It contains spoilers, obviously, but as a fan of the show and the book series... holy shit.
The use of music is great, and pay attention to which characters are on screen during which words. We already know that the events as portrayed in the book have been adjusted and shuffled around, so it's hard to know exactly what we're seeing here and the importance of each scene.
That being said... it's time to start counting down the days. Be sure to watch the trailer before it's taken down, and share your thoughts in the comments.