Sony also added the new HD trailer for GT5
on the PS Store for download. This is the trailer that was shown during yesterday's keynote speach prior to the start of the Tokyo Game Show.
As far as graphics I wouldn't suggest reading too much into these videos, especially the ones that have been clearly downscaled from their native resolution. After all, even GT:HD which was completed a year ago looks far far better than GT4 and arguably better than current driving games.
As far as sound, this is always going to be a sticky issue. Not only because there will be a ton of subjective differences of opinion/preferences. Some people like exaggerated engine and exhaust noises often found in arcade style driving games like NFS, other do not.
Also, there are soooo many variables that effect how a real car sounds in the real world. You can take a car and record its sound on a track, come back a month later and depending on the condition of the car, temperature, etc, it can sound very different.
Adding to the variables, there can, and often are differences in engine, and particularly exhaust sounds from two of the same model cars. Who's to say which is "accurate"?
It only gets more complicated when you start comparing "car sounds" of older and especially classic cars, where differences can be quite noticeable.
Then to top it all off... trying to evaluate "car sounds" from internet video clips that who knows how badly they have been compressed or altered, and then listened to through a typical PC sound system, is like trying to judge the quality of different vodkas by tasting them after they have been made into mixed drinks. Really pointless, in my opinion.
Judging on the documented amount of effort and detail PD has shown that they used to record and capture the sounds of many of the cars in GT4 and from what I have heard, GT5 as well, at least we know they aren't just "making it up", unlike the often highly exaggerated car noises found in many other driving games.... but then again, it's also a personal choice, and I completely understand that for many, they may very well prefer those types of car sounds.