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.
Gallery: Gran Turismo 5 Prologue