When Marvel released their teaser for Avengers Assemble #1, Thor was noticeably absent in the image (which is meant to be an Avengers title that can tie in with the upcoming Avengers film without being an actual adaptation).
However, if you look closely at the image, you'll notice that Thor was likely just cropped out of the image to keep up the mystery of whether he is still around after the events of Fear Itself.
To wit, look at the speed lines on the right of the image...
Pretty funny, huh?
Now, I suppose someone else could be holding Thor's hammer. I just am amused by the fact that you can see the outline of the hammer and the hand in the speed lines.