HBO has just premiered this new trailer for its upcoming fantasy series Game of Thrones. The series is based on the “A Song of Fire and Ice” novels by George R. R. Martin, which HBO describes as “the Sopranos in Middle Earth.” The novels are set in a land called Westeros, where the royal family struggles with enemies and one another for power. The tagline “Winter is Coming” has been used repeatedly by HBO in promotion of the series; this is because “summers span decades and winters can last a lifetime” in Westeros.