"There's no plans in the works for GT5 yet--that might be 2009, or it might be 2010," Yamauchi told IGN. "But we're totally focused on getting the updates through for Gran Turismo 5 Prologue, and that's all we're focused on." nope
Prologue is set to gain several new features, including vehicle damage and video content, later this year. Released in North America this past spring, the $39.99 Gran Turismo 5 Prologue is meant as teaser to the eventual Gran Turismo 5, packing 60+ vehicles and six tracks.
As for the long-awaited PSP edition of Gran Turismo, originally announced in 2004, Yamauchi informed Joystiq that the portable version is likely to arrive after GT5.