Article: At E3 2007, Sony was able to show a number of their upcoming video games for PlayStation 3, including Heavenly Sword, Lair, Ratchet & Clank Future: Tools of Destruction, Warhawk and Uncharted: Drake's Fortune; all of which were released in the third and fourth quarters of 2007. They also showed off a number of titles that were set for release in 2008 and 2009; most notably Killzone 2, Infamous, Gran Turismo 5 Prologue, LittleBigPlanet and SOCOM: U.S. Navy SEALs Confrontation. A number of third-party exclusives were also shown, including the highly anticipated Metal Gear Solid 4: Guns of the Patriots, alongside other high-profile third-party titles such as Grand Theft Auto IV, Call of Duty 4: Modern Warfare, Assassin's Creed, Devil May Cry 4 and Resident Evil 5. Two other important titles for PlayStation 3, Final Fantasy XIII and Final Fantasy Versus XIII, were shown at TGS 2007 in order to appease the Japanese market.

Question: What Gran Turismo game was shown in 2007 but not released until after 2007?
Gran Turismo 5 Prologue