I have no idea when it'll be available or what changes will be made but I can say that its an awesome car. Handling is very neutral which means that your setup will really be the factor. Its simplicity really makes it easy to setup too. out of the box its a pretty competitive car.
I think OFNA just wants to clear up the small details on the car. In my experience the car does need a little revision with the drivetrain, which i was told has already been fixed. so when the car is released in the US market the car should be near perfect. They just want to bring out the full potential of the car.