The response to The Dark Knight Rises trailer was perfect in my theater. People shushed when it started, were quiet throughout, and applauded at the end.
My midnight crowd, same thing.
The 7:30pm I just came from though, nothing.
I take that to mean the die hards were there midnight, general audiences not quite at the same place yet.
No reaction for Spider-man though at either, which is telling imo, especially the midnight bunch.