Heres a link to a scene by scene picture and caption guide for the Scream 4 trailer. I thought it was interesting and I noticed one or two things I hadn't spotted in the trailer, so I though other members might like to see it. It also helps identify which characters are getting attacked by ghostface.
No. There's a Stab party scene or something. My guess is she's wearing it as a disguise. Why would they reveal the killer in the commercial? Besides we see her getting chased/seemingly about to be killed.
