Beyond that, though, it remains to be seen if they’ll write the other two installments, as was the original plan, or if they’ll be involved with this arm of the Star Wars franchise beyond writing. When it was officially revealed they were tackling what was vaguely described at the time as a Star Wars film series, David Benioff and D.B. Weiss would also produce.
Article source: https://www.cinemablend.com/news/2478197/game-of-thrones-creators-might-not-write-all-their-upcoming-star-wars-movies