I think we may have it on our race car, but cant say it is for sure untill I ask Marlin, as back in October when we collected our car Mark gave us prototype rear hubs etc. Ill ask the question and let you know, but haven't really driven the car yet to comment what its like.
I was down at the factory recently collecting some parts, I never got to see the new suspension, but looking at the pics of a previous thread put on by Jon@JNRacing.co.uk I think his car does have the new setup.