Just because they state that it is realtime doesn't mean that you should expect graphics like this in game for quite a while. If you take a Tripple Geforce 8800GTX set up and run a demo which has a lot of the clipping and culling pre-computed, which has no noticeable AI, and with the "physics" being animation, and rendering at 720p @30fps, you should be able to approximate the graphics the PS4 will produce.