Here's their response...
Hi
At this time these vehicles are under review. While these vehicles are still under review they will remain banned until the status can be verified. The assessments should be completed prior to 1 August 2014 for the introduction of the new laws. Continue to check back on the website over the coming weeks for further updates.
The vehicles that will be banned have characteristics that are high-risk for inexperienced drivers, and are:
• Vehicles with power to mass ratio above 130 kilowatts per tonne (based on tare mass), or
• Vehicles with significantly modified engines that require certification under the Vehicle Safety Compliance Certification Scheme, or
• Other vehicles classified as high performance because they have risky characteristics such as fast acceleration
Regards
Jeff