1.Motion Blur(I know it‘s there but it is really buggy.) 2.Rain/snow and windshield wipers working together 3.Mud not getting through the car,instead making the car dirty 4.Some shaky ‘movement‘ on the orbit camera at bumpy roads etc. (for example Drive club) 5.More realistic grass/generally higher quality textures,especially leaves.(Even official maps) 6.Scraping sound while on roof or scratching the wall 7.Scratch textures on the vehicle 8.Making mirrors more realistic,i mean you cant even see the own car and in general it‘s buggy (Quality isn‘t that great too) 9.Ability for the windshield to break,aswell as the a-pillar
A lot of those has been suggested before. But, I think there might be a possibility that some of those may happen in the future.
I think better off-roading physics would be cool. Here's my list of ideas: 1. If you're driving on grass or through plants, the car should 'hit' the plant instead of clipping trough the car. 2. Better mud and water physics would be cool. When you go into water or mud, there should be splash particles. When you leave a pond, there should be water particles that would drip down from your vehicle. Watch this video and you'll get a good idea of what I mean: