I played the demo at the Best Buy in Daytona Beach tonight.
It was not advertised anywhere on the PS3 stand, but I just quit the demo that was on using the PS button, scrolled through the available demos, sure enough GT5 2010 Demo came up and I was on the Nuburgring in Jeff Gordon's Impala. I never ran out of 4th gear up to the bridge where the 2:00 timer ran out. It was not easy to drive the car as I was unable to move the gas/brake to the triggers on the DS3, all options other than tire choice and regular race settings were unavailable. Over steer would be very correctable with smooth inputs from a wheel, or if you can manage, a steady thumb, something I don't seem to have.
Edit: There was no damage in the demo I played.