I'm comparing initial 2013 footage here:
http://www.youtube.com/watch?annota...&feature=iv&src_vid=1DgFrYU1xNA&v=htJyuVRa0-c
To this latest footage here:
http://www.everyeye.it/video/ps4/watch-dogs_videoanteprima_13243
Well, from the initial reveal footage, there is an amazing wind effect that interacts with the environment that appears to missing in all the footage from that Italian site's video. The depth of field effects in addition to the general blur effects are noticeably worse as well.
The shine/reflections and other details on the sidewalk and streets appear to be gone. Bricked areas used to look like actual bricks, but now they look like flat textures (either from the lighting changes or the lowered detail). The density of floating particles seems to be diminished if not removed entirely (i think i did see a can and a leaf blow at one point, but much less than from the 2013 footage).
The daytime lighting is a huge downgrade. The new footage looks flat and overly bright, whereas the initial footage went for a realistic environmental lighting that looked amazing. There are still some gas effects coming from the sewers, but most of the other wind effects seem to be gone.
The streets appear to be much less densely detailed as well with less debris and general objects in the environment.