I played the demo for NHL 08 the other night, and I was pretty happy with it. They made some big improvements on the gameplay, particularly with the AI and skating. The biggest selling point for me is that, when in the offensive zone, players are keeping themselves in position to make the palys. It's hard to explain, but players are now skating and have the ability to handle the puck to the sides, instead of always having their stick stuck in front of them. Also, defensemen are a lot more aware of holding the point, and the AI was passing very well against me. I only got to play a single period in the demo, but it was enough to convince me to pick the game up.
I'm hoping the franchise mode will be improved, I'll post my initial observations later.
Oh yeah, I'm getting it for the 360. I'm not sure how other versions will play, I don't think I could go back to a non-skill stick version.