oh I see...but the water in KZ2 didn't had any reflections either. It may look like that in the video, infact it may even look like reflection when you see it for the first time while playing it, but when you actually observe it you'll see that the water isn't really reflecting anything at all.Err, I meant the ripples in KZ3 are nice, but the surface of the water is more simplistic and there are no reflections anymore like it had in Killzone 2.
One of the devs in the Behind the bullet video mentions that they didn't do any reflection and refraction for KZ2 cause they implemented it very late in the development cycle.