Myself and Tool have been discussing the images posted and we have noted down some extra details that some may find interesting. ;)
1) Bumpmaps have been added to the environment. (trees, roads, sand, hills and grass)
2) Updated reflections on the vehicles.
3) Updated carbon fibre textures.
4) Overall texture quality is vastly improved, eg. Vehicle headlight textures.
5) Polycount on vehicles has been vastly improved, eg. Mercedes Gullwing photo and overall wipers.
6) Dynamic shadow has been improved dramatically. No rough edges.
7) Window wipers look they will have motion.
8) No driver in cockpit as it seems you can select and deselect the driver to be there during this time. *See Dodge Viper image*
9) Wheels now have motion in photomode.
10) Transparency of plants and trees has been majorly improved.
11) Draw distance has been improved as there is no noticeable blur on objects and scenery in the background meaning low or no pixelation.
12) Human avatars appear to have greater quality to them, probably a higher polycount.
13) Selection of interior colours appears to be back. eg. Gumpert has orange interior colour compared with other games and such.
14) HDR effect appears to have been improved.
15) Different variations of vegetation and tree trunks giving a greater variety compared to the first installment.
16) Possible 3D birds flying around as they appear to have bulges to them.
17) Blur effect seems to be improved in photomode with a probable AntiAliasing boost.
18) Different variations of buildings including buildings situated on top of hills.
19) Avatars now have different and vastly improved facial expressions as the detail on their face stands out a lot more.
20) Vehicle window transparency has changed with cars have varying window transparency each unique.
21) Vehicle vents now 3D instead of being a flat texture with a bumpmap on it.
22) Possible fog levels in the game as in the distance in the Gumpert image it seems to be "foggier" than the rest of the images.
23) Possible fog lights turned on in the Zonda F shot while the headlights are turned off.