I think they are doing the right thing by hiding Sadie Sink's role. These days it feels like every big movie gives away the biggest surprise before release. I would rather spend two hours in the theater and actually be surprised. The line about the villain looking like anyone got my attention more than anything else in the trailer. It makes me think a lot of the footage we already saw might not mean what we thought it did. If that is true, then Marvel did a better job hiding the story than usual. I still think Jean Grey is the most likely choice, but I would not be shocked if they have something completely different planned.