Gran Turismo HD Concept
Gran Turismo HD Concept sometimes GTHD Concept with "HD" standing for high-definition), was the first installment of the Gran Turismo racing series to be released on the PlayStation 3. It was made available as a free download which was released on the PlayStation Store on December 24, 2006. A Blu-ray Disc version, called "Install Disc", was released in Japan in limited quantities in September 2007. This game was intended to be a sneak preview, in the likes of Gran Turismo Concept, preceding the release of a full version title but the Gran Turismo HD project was cancelled and replaced by Gran Turismo 5 Prologue.
On the September 22 2006 Tokyo Game Show opening, Famitsu's website released details and a screenshot about a new Polyphony Digital project, Gran Turismo HD, scheduled from a December release. Two versions would be simultaneously released, the Blu-ray Disc based "GTHD Premium" (GTHDプレミアム) and the PlayStation Store downloadable "GTHD Classic" (GTHDクラシック).
During the Tokyo Game Show, Polyphony Digital unveiled the first Gran Turismo HD teaser, it featured HD renders of five cars: Nismo GT-R R-Tune R1 '99, Honda S2000 '99, TOM'S Castrol Supra JGTC '99, Ford GT '05 and the Ferrari 599 GTB Fiorano '06. The first four cars were available in Gran Turismo 4 but didn't appeared in late GTHD trailers, though the Ferrari was featured in Gran Turismo HD Concept. Kazunori Yamauchi confirmed the full version of Gran Turismo HD was scheduled for a December 2007 release in Japan. Among the planned contents he introduced an "iTunes-like" download service and various download packs including additional cars and tracks, advanced AI or car damage, all of which being compatible with the future Gran Turismo 5