Here is an video from the PhysX review, not complete yet though. But it shows dynamic storm/wind effects blowing leaves and stuff in the air. I like how it interacts with the Beam spell, but overall it might be a bit overdone. Have to wait and see, because anyway it was done with storm+rain. To bad it doesn't show more particle spell effects, which is more interesting to see how they done.
Btw, they also posted on the forum today
a design preview of the upcoming expansion with a special mount.