Season 4 Spoiler in the trailer

I'm not sure if anyone else has commented on this yet, maybe some one has, I haven't seen it. I've watched the new extended trailer a number of times, and I noticed this one little part that I had look at several times, but didn't see. After Locke says that there's a traitor, there is a brief shot of Sayid and Sawyer grabbing Jack, with Jack saying, "Let go of me." So it seems, that those who side with Jack will be the ones leaving, and those who side with Locke won't be.