Gran Turismo is offering 3 free new cars (ISO Rivolta Zagato VGT, Audi R18 and the Shelby Cobra 427) to the game for patch 1.06 coming on November 27th, before their largest update since the game's release.
Planned for December, the update will be the new single-player mode called
"GT League" which is based on the previous game's
GT mode. In GT League, players will be able to participate in cup races of many different difficulties and even take part in endurance races. More races will be added throughout 2018. In addition, 12 new cars will be added to the game in the same month. Check them out
here.
Many more updates are to come for Gran Turismo, including a planned 50 cars for release before March 2018.