Things have been pretty quiet since Scream 4 was announced as being in production in July 2008, but today RopeOfSilicon.com has been provided with big news: the sequel is moving forward! Not only is Scream 4 working towards production, but according to a document from the William Morris Agency, sent by an anonymous source, the fourth installment of the film is kicking off a new trilogy. This means we will get a Scream 4, 5 and 6 from the series’ co-creator Kevin Williamson, who is reportedly writing a draft of the sequel. To see the screen capture of the email, click here. A separate source also reports that Scream stars…