The news automatically evokes images of Jon Snow wielding a lightsaber, Daenerys battling X-wings on dragonback and Ramsay Snow taking on the role of Grand Moff Tarkin. Not that there will be any explicit crossover of course.
But the fantasy show and sci-fi series may have more in common than you think. Do you know your Dothraki from your Darths? Can you say whether the following quotes come from Game of Thrones, or Star Wars?
Take our fiendish quiz now to find out. Good luck - and may the Starks be with you.
Have your say on the latest TV with Screen Babble, the television discussion group on Facebook.