EDIT: Don't get me wrong. I think the audio in KZ2 will be impressive ! But I just don't think the audio part came through in all these relatively low quality trailers (sound quality speaking). None of them are on par with the game's original sound yet people all over the net loved the trailers. So they must be doing something right about the visuals. ^_^
I think the reason why most reviewers talk about the graphics is because that's the only thing their testing rig can show. I doubt testers have a nice surround sound setup that they can crank up the volume to actually be able to appreciate the audio. As I said the graphics look great but take away the sound and the cinematic experience is almost completely gone. In fact take any blockbuster movie and turn down the audio, there's a huge difference. It's like the difference between watching the film vs being submersed in the film. Maybe it's just me but when I watch the HD KZ2 videos without sound it's pretty but not very submersive at all. Watch it with a nice speaker setup and it's like being in the middle of a battlefield. Also from what I've seen there's no film grain effect in the game. There are post processing transparency effects but no film grain effects.