George R.R. Martin is currently working on a fourth installment in the Tales of Dunk and Egg series, according to A Knight of the Seven Kingdoms showrunner Ira Parker.
Parker noted that the upcoming fourth book features a “very cool location” and will help map out the show’s potential long-term future. While the series is currently greenlit only through Season 2, the team is looking toward a potential run of three to five seasons as they adapt Martin’s expanding universe.