Gran Turismo HD Concept happened in 2006.
Gran Turismo HD Concept was created on 2006-12-24.
No, they have scraped the ''HD'' idea and replaced it with ''5 prologue'' but they will be making a bigger version of Gran Turismo 5 Prologue, called Gran Turismo 5 in February 2010, because there are only about 60 or so cars. The release date for Gran Turismo 5 is now TBA 2010 as of April 29 2010 has been announced 13 November 2010
Gran Turismo HD came out a long time ago, when the PS3 first arrived. It is a downloadable game from the PlayStation Store. It features about 10 cars, 1 track and is completely free.
Wakeboarding HD happened in 2010.
Spelunker HD happened in 2009.
Choplifter HD happened in 2012.
Pinball HD happened in 2010.
Cubixx HD happened in 2011.
Rez HD happened in 360.
Digger HD happened in 2009.
Wipeout HD happened in 2008.
Trials HD happened in 2009.