Courteney Cox is yet to sign up for ‘Scream 7’. The ‘Friends’ star – who has reportedly been in talks to reprise her role as Gale Weathers in the upcoming seventh instalment in the iconic horror franchise – has insisted she hasn’t actually agreed to be part of the movie. She told Variety: “I’m not officially signed on. I’m not, but there will be a ‘Scream 7.’ ” It was revealed earlier this year that Neve Campbell will return to the film series, having skipped the sixth movie over a salary dispute. Kevin Williamson – who wrote the script for the first ‘Scream’ in 1996 – will direct a film in th…