I always thought the tracks looked a bit too clean, it made them feel lifeless... I'll welcome any change that might remedy this.
Also, I can't wait for the laserscanned Red Bull Ring they announced for 2016... I know the modded one is really good, but still has some flaws... It'll also be interesting since it's the only track in AC's lineup that I have actual experience with, so it's the first chance for me to really judge how close its physics are to real life...