I have played what I believe to be the final build at the Sony Day in Salzburg, two days ago. What you don't see in the low-res comparison video is that the EQ on the track is still there, albeit heavily toned down. I would have preferred the original Zone mode, but as it stands, the final version is not bad by any means. Just not that spectacular.
I also had a brief chat with Clemens Wangerin (very nice lad, by the way), and we were playing the new splitscreen mode together (vertical split, 2 of 2 races won by me ). Split screen is very consistent 30 frames, didn't notice any chop or slowdown at all. However, when you go back to single player afterwards, it feels like a completely different game on 60 frames.
Oh and you are gonna be freaked out by the texturework once you see it on your PS3. None of the videos you have seen so far do this game any justice

Side note: Asked about the release date, Clemens wouldn't answer. I then told him my money was on the 25th, and his response was 'I hope you did bet a lot of money then...'
Depending on wether he liked me or not, that might be your confirmation right there