Today, it was announced that there would now be a Game of Thrones newsletter called "Whispers of Westeros." It's "The Official Game of Thrones Newsletter" and is located at whispersofwesteros.com.
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Perhaps people that sign up for the newsletter will receive trailers shortly before they hit social media. This could also mean a trailer for Season 7 is on the way.
The first episode of Season 7 of Game of Thrones airs on July 16.