A ‘Game of Thrones’ movie is in the works. Warner Bros. have reportedly been quietly developing at least one film set in the fantasy universe created by author George R.R. Martin. However, sources told The Hollywood Reporter the project is in “very early stage” development and currently has no filmmaker, cast or writer attached but the studio are keen to explore the idea of bringing the saga to the big screen. ‘Game of Thrones’ showrunners David Benioff and D.B. Weiss famously wanted to conclude the series – which aired on HBO for eight seasons from 2011 to 2019 – with three feature films inst…