The fantasy series based on the George R.R. Martin novels has been one of HBO's most successful shows.
No spoilers are in the trailer, but among those featured are Arya (Maisie Williams), as well as Tyrion Lannister (Peter Dinklage), Daenerys Targaryen (Emilia Clarke), Sansa Stark (Sophie Turner) and Cersei Lannister (Lena Headey).
HBO isn't getting out of the "Game of Thrones" business. A prequel created by Martin and writer-producer Jane Goldman is underway, with Naomi Watts set to star, and other spinoffs are possible.
