They can't. Not in public forums anyway. I know people who have attended the preview. And that's not because the movie is bad, far from it. Sony has sold the rights for the first reviews in the USA it seems. But one international review popped up today, that one from Netherlands... it's legit. I asked my friend about it, and while she disagrees about the reviewer's complains about the Lizard, that was the same movie that she saw. She can't give me spoilers and even if she could I wouldn't want to read them. I just asked her if the spoilers in the review are in the film, and they are.
The first review comes from a well estabilished movie website from Netherlands. They do have pretty high standards when it comes to reviewing films, so that made me even more excited for TASM. I think that soon the US reviews will start to pop up too, and we'll have a better idea how the movie critics will receive this, but what I've heard from my friend is that at least at her screening, everyone was pretty excited and raving the film afterwards. She was a plus one, but she also can't talk, and that's why people don't pop up here to talk about it. I don't know how RIM will pull this off, but maybe he doesn't live in the US, I don't know. But what I know is that they made all of them sign the embargo documents.
Regardless of that, I think it's fair to assume that things are shaping up amazing for Spider-Man, the review that it was posted today was very good and RIM will be able to see the film soon enough to at least double check the info that I'm giving here.
