Unsurprisingly, Polyphony Digital is taking its sweet time with Gran Turismo 5. Speaking during E3, franchise creator Kazunori Yamauchi stated that the complete Blu-ray disc version of GT5 might not arrive until 2010.

That’s a long time away! So will we see anything from Polyphony during that time? Yes, Yamauchi says that Prologue — the downloadable prequel — will be further expanded upon, with additional updates adding new cars, tracks and features.

This news certainly doesn’t bode well for PSP title Gran Turismo: Mobile, which Yamauchi assures is still in development and scheduled for a release after GT5 is finally out the door.

Kazunori Yamauchi: More Prologue, no GT5 soon, GT PSP still coming [Joystiq]

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Read more: Polyphony May Implement Vehicular Damage In GT 5 Prologue,  Gran Turismo PSP Still Under Works,  Yamauchi Assures That Gran Turismo PSP Is Still Moving Forward, Still No Release Window,  Gran Turismo Mobile Still Under Development, 2008 Release Unlikely,  Rumor: Gran Turismo 4 Mobile Canned