Husky, no one here mentioned any graphical changes that you yourself didn't just mention in that same post. Lighting changes that are slightly noticable and a change of some kind in the cockpit view angle. I havn't seen anyone else mention anything else graphically speaking. At least not yet.
So it's not a placebo affect unless you're also being affected.
About your comment on the sound though. The in-car and bumper cams definitely had their volume on your own engine turned back down to where it was before the previous update. The very last update our engine volume was turned up in those 2 particular views. This update did change them back to being lower.
Also about the improvments to the engine sounds of the other cars.......you're right, they were turned way up and I think that's great, I pointed that out on the first page. But I'm still hearing whether they in front or in back of me. I don't think it's lower sound detail so much as it's just a very dominant sound now so you may ahve to listen more carefully if you aren't using surround sound.