This is a quote from Aristotelis Vasilakos :
You can only immagine when around the end of November with still all the Porche Pack 3 cars open in development, it was clear to us that the RSR couldn't happen in time. With people waiting for it, having already paid for it (people with the Porsche season pass) etc... we were in a dead end. So a decision had to be made. A replacement, cool enough to substitute the 911 RSR, but realistically feasible in a very short amount of time. The 911 Turbo S, seemed a good solution, also requested by the community. Ask Porsche for permission, buy vitamins and energy supplies for the 3DArtists, the sound engineer, the 2D skin artists... (I talk in plural, but as you know, in the end it's the same 2-3 people...) It was a tour de force, one of those moments that you want to close your eyes and just hope for the best. All at the same time as the other cars are being optimized and finalized, while the developers keep pushing to make the console version better and better, while doing submissions to Sony and MS, and while improving PC version core code and new features (you'll see...)