If you look closely they turned off a couple visual features so that they could focus on others. They turned Shadow quality down a bit, you can see some small aliasing in the new version. They also turned down the Anisotropic filtering, this can be seen when looking at the details in the sidewalk. The edges are more blurred and not quite as clearly defined. This could also
What you do get however is better Ambient Occlusion helps the image look better and have much better lighting effects. It also looks like they bumped up tessellation a bit since most rounded objects do appear to be a bit more true round.
In the end I approve of the changes made.
**Edit - Oh and if you look closely at the crowd in the distance it looks as though the draw distance was also increased just a smidge.