This should be taken strictly as rumor at this time. While the casting for Scream IV continues to grow, a few stars flew back to Hollywood (Lake Bell, Lauren Graham) declaring script changes and timing as the reasons for their departure. Zap2It is confirming the reports adding that The Ring and Scream 3 writer Ehren Kruger has been doing on set rewrites for Wes Craven and Dimension Films. Even more shocking is that they report that Kevin Williamson’s involvement with the project has come to an end entirely — meaning Scream 5 is a no-go at this time. The plan was to kick-start an entire new trilogy. Here’s the kicker: “Hayden Panettiere’s role, which one source says ‘used to be really sharp’ has now been ‘dumbed down significantly.’ The actress is ‘beyond frustrated with the changes.’ Another source says that Lake Bell, who had to drop out of “Scream 4″ due to scheduling changes, ‘dodged a bullet.’ ” D-yikes!