Did a google search and came across several sites. Couldn't find one that gave a detailed description but its basically a wheel within a wheel supported by bearings. The concept has been around for awhile and has never gone into production. Design and reliability issues I'm sure.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.