Gran Turismo 7 update 1.15 was released today for PS4 and PS5. You can find the complete patch notes for this update here.
As promised by Polyphony Digital in the update roadmap for Gran Turismo 7, they are continuing to add new content to the game including additional cars, tracks, and more. There are three new cars added as part of this update in addition to various other changes. Take a look at the patch notes for this update below.