No NASCAR here. Just plain old Grand Turismo. The trailer shows off night time racing along with damage on cars.
On a side note though. Sony previously said that Summer 2010 was the release of Gran Turismo 5. During their GDC conference they just said 2010. That doesn’t mean it has been pushed back, but it could be a possibility since the Japanese date got pushed back a few weeks ago.
(Source: PlayStation Blog)