Gamespot, Gran Turismo 5 Prologue will arrive as a free downloadable title on the PlayStation Store later this year. If this is true, Prologue will largely expand upon the previous free GT download, Gran Turismo HD. Prologue adds more cars and tracks, and a slew of new features, such as a new "TV" mode. The TV option will provide users replays and videos from manufacturers. A great Game
A new "Home" mode will allow greater integration with the upcoming online service. "The goal is to create as seamless an experience between the game and the Home service as possible."
Just like the PS3, the goal is to have Prologue constantly evolve through updates. "It's possible that additional improvements, such as damage modeling, could be a part of a future update to the game somewhere down the line." Certainly, exciting -- hopefully, we'll find out more as Tokyo Game Show draws nearer.