Just incase you don't already know here's just a little warning, if you're on IMDb or anywhere else and you see a thread/link mentioning Scream 4 sides AVOID they're certain pages from the script. I haven't read them but people are discussing them on IMDb a lot it seems and I clicked on one thread mentioning a Scream 4 Side, not knowing what a side was and one guy mentioned what he thinks the script is hinting towards in terms of the killer(s), it didn't give anything away really but it easily could've.
EDIT: Be careful in general when on the S4 Boards, some guy didn't add a SPOILER warning and I just found something out, nothing bad, I'm actually relieved lol but still spoilers suck.