Gran Turismo 5 Won't Just Be A Beefed Up Prologue.

Series veteran Yamauchi told PSM3 magazine so.

“Prologue is really only a prologue,” he said. “Though the look and feel of Prologue and the full version will have uniformity, the full version will be totally different in terms of scale and diversity in comparison.”

Sounds obvious - but he's right. As well as a more fleshed out engine and a few hundred more cars, Gran Turismo 5 will feature night-time races, damage models, WRC and NASCAR. Which is already a whole pile of new content.

Expect a full blow out at E3. If that doesn't happen - be very afraid.