Supercars, formerly V8 Supercars, are going to their Gen 3 package in 2022.
Like NASCAR, Supercars are changing the bodies to be more like production models, and to better fit the cars that will be used.
Gen 1 and Gen 2 of the spaceframe cars were designed around the Ford Falcon and Holden Commodore. They had a standard chassis with a standard wheelbase. Which is why the Ford Mustang looks so odd in the current, Gen 2, configuration - taller and shorter than the production car, it looks like a caricature.
The Gen 3 chassis allows for different wheelbases and is lower, allowing the coupe bodies to fit better.
At the moment there will be two models - the Mustang and the Camaro. When the rules were being devised there were a small number of Camaros being sold in Australia, converted to RHD by HSV. But the Camaro is no longer sold in Australia. Soon it will be just the Corvette and Silverado.
The engines are described as "crate" engines, though they aren't really.
The Camaros will use a 5.7L LS variant, the Mustangs a 5.4L Coyote variant.
Triple8 Racing have been testing the new engine