I'm not gonna comment too much about the presentation itself cuz that was down to a couple of guys who don't usually do this sorta thing...
As for the game, it looked good, but didn't look spectacular... I guess it came down to my own expectations. I should add that the gameplay was from streaming footage so given lag and whatnot, it likely didn't look as good as it should have. Ultimately, we'll have to wait for the final release to judge.
Sound... Aye... for starers, the tyre squeal (from what I could hear) was way too loud... and it sounded similar to GT6. As for the engine note, on some cars it sounded similar to GT6 (slight improvement perhaps?), but on others it sounded a bit more throaty... a bit more grunt... especially from the onboard view. The guys kept talking and there was background music so it was tricky. Kaz said that there would be drastic changes, but from this demo, I didn't sound like it.
50%... that was the comment that Spanish emcee guy said... according to Kaz. 50% might be a bit of an exaggeration as we're less than 6 mths from release... but the point he was making was that a lot could still change. Fingers crossed.
As for the racing, the Nurburgring one was actually pretty good. It was really scrappy at times, especially on the first lap, but I think it was cuz the guys were still getting used to the physics and cars. Other than that, there was some pretty good racing towards the end.