Johnson said there was "never any outline or treatment or anything" for the remainder of the films, though he did note that the ideas he had were "all very conceptual" without further elaboration. Lucasfilm first announced the planned trilogy in November 2017, a month before The Last Jedi 's theatrical release.

Director Rian Johnson explains why his much-anticipated 'Star Wars' trilogy was shelved. Following the success of 'Knives Out,' Johnson's focus shifted to murder mysteries, leaving the space opera project undeveloped.

Filmmaker Rian Johnson revealed the reason on long-romoured Star Wars trilogy that never happened. He and Kathleen Kennedy were having an idea of developing three-film saga saying he was busy making murder mysteries.