Like Mulholland Drive Riverside International Raceway really didnt die. It just went away for a few years before finding a new home.
Riverside Motorsports Park
http://rmpracing.com/index0.htm
If you check out the map of the park the main road coarse is an uncanny clone (somewhat) to the original track with a few added features. (40 possible variations of the course) that can be quickly changed for different types of racing. 1200 acres for multi-motorsport use.
Check out the sight. A business associate up in Santa Maria has been to the location and says its the real McCoy. Upon inspection of the planning prints he said it was like seeing a ghost except better.
Some top dogs are involved with this project. I am sure when it is completed it will be something.