But in the first trailer they went through the clouds so they do have volumetric clouds if required to go through them !
Which trailer are you refering to?
Clouds in the offline rendered cgi e3 2005 trailer is definately volumetric, i dunno how "volumetric" the clouds in the e3 2007 trailer is.
The compression quality on the gametrailers version of it (even in hd) is terrible, the colors are very washed out so it hard to really see how volumetric they are.
The far sky above sometimes looked like panned 2d backgrounds, similar to how they do backgrounds in GT5P (or in the early demo thingy) or maybe GT5P is actual geometry in 3d? I dunno. It looked kinda flat.
When they drive through the cloud\smoke it does not look all that volumetric to me, looks very similar to how 2d smoke has been applied in other high end games. (Several games have had very impressive non-volumetric smoke from distances)
But again, this may very well be because of the terrible color contrasts in the video and that i simply cannot notice it because the video quality is so poor, it might very well be volumetric, but from the trailer i really couldn't see any difference compared to how other games do 2d smoke combined with clever effects.
Btw, i really LOVE how everything thing looks in the 2007 trailer when there is a bright light from an explosion and how it all looks stunning when the light shines down on them and the shadows come into play.
Seeing all the trailers again was interesting. I really like how the hellgausts look now, compared to the CGI, the art is much better now than it was. That coat that made them look like ww2 soldiers looked ridiculous imo. I like the more "special-forces" look they have now.
My only gripe with this games graphics is that the environment often looks rather flat and uninpressive. Like it could have benefited from some shaders
To make it a bit more bumby.
I absolutely love some of the lighting effects applied to this game, i really think its one of KZ2's strong points. (much like the first level of CoD4 looked amazing sometimes imo).