Yeah, it is.

I was just watching some guy's video where he talked about random stuff on/for the PS3. He happened to have a 1 minute trailer for Resistance 2 at the end of his video.

From what I have seen, its more polished, graphically, and it looks like they put more soldier units (both allie and enemy) on screen.

The video.
http://www.veoh.com/videos/v1105123E...1085484&rank=2
If your not interested in watching the full video. Wait till it fully loads, and watch it around the last 1-2 minutes.