The people at Car and Driver initially leaked a render based on the 2024 Mustang’s CAD for the “new” 2015 Mustang on the cover of C&D’s November 2012 issue?
To be completely honest, at the time, in 2012, the design hadn’t been finalized but narrowed down into 3 to 5 designs. Three of those designs ended up the 2015, 2018 and 2024. Some unused CAD was incorporated into the Roush and Steeda designs.
The Mustang GTD is probably the freshest design Ford is currently using, developed after 2020…