For those who are anxiously waiting for more news on the development of iRacing dirt, here is a mini update. This was posted in the official iRacing forum by iRacing staff member Greg Hill.
Development work on dirt is going great! The physics, art, and track dynamics systems are all starting to work together in real-time. Today we took the #25 Sprint car out for a spin at Eldora Speedway. Here you’ll see the first glimpse of a prepared track beginning to develop a groove. Not yet visible but almost ready will be the accumulation of loose dirt and a cushion. Again, this is all dynamic… the track will constantly change and react based on the cars, resulting in an unparalleled dirt racing simulation.