“Pose” star Billy Porter is in negotiations to join Camila Cabello in Sony’s reimagined musical version of “Cinderalla.” If the deal goes through, Porter will play Cinderella’s fairy godmother. Sony had no comment. Cabello came on to the project in April with “Blockers” director Kay Cannon attached to helm and pen the script. Cabello will be involved in the music for the project, which grew out of an original idea from James Corden. The film will be produced by Corden and Leo Pearlman through their Fulwell73 banner. The new “Cinderella” will be a music-oriented version of the traditional tale of...