UK developer Bizarre Creations has confirmed that there'll be no more DLC for Project Gotham Racing 4 on the company's official forum.
"Sorry, but you won't see any more PGR4 DLC from Bizarre Creations," said a spokesperson.
"We've handed over the reigns to Microsoft now. It's possible that they may create some more content in the future, but we haven't heard of anything in the pipeline I'm afraid."
So there you go.