Here is the article from a reporter for Collider:
"Earlier tonight I was on the red carpet for Spike TV’s 2009 Scream Awards. While there I was able to interview a number of people and the one you’re about to watch is with Stan Lee. While we broke the news months ago about Stan Lee’s cameo, if you missed our story or you’re trying to stay spoiler free…DO NOT watch this interview! That’s because right at the beginning Stan Lee talks about who he plays in the film. Also, he says he’s already met with director Kenneth Branagh about his Thor cameo, but he doesn’t know what the cameo will be."