The Ford Mustang is supposed to get a new Shelby GT500 model next year, which will be used as the range-topping model of the Mustang lineup.
Expectations
There are small changes to trim level equipment and a bit of changes to color selection. Another change was the introduction of Shelby GT500 as a range-topping model.

source:edmunds.com
Leaks of the design
While under testing the 2023 Ford Mustang could be seen on several occasions and here’s what people got from that. In April we could see that the car had less camouflage and that the flagship Mustang looked powerful. In December there was a leak of a CAD drawing that showed us it had a supercharged engine.

source:edmunds.com
Body Styles
This variant of the car is going to have two body styles, a two door hardtop coupe and a Two-door soft top convertible.

source:edmunds.com
Platform and Powertrain
Just like the sixth-generation models of the Ford Mustang the 2023 one will have the Ford S550 platform. The longitudinal-engine, rear-drive architecture is currently used exclusively on the Mustang.

source:cnet.com
There a couple of choices when it comes to the powertrain and they are: a 2.3L EcoBoost I4 (Mustang), a supercharged flat-plane-crank V8 (Mustang Shelby GT500), a 5.2L Voodoo V8 (Mustang Shelby GT350) and a 5.0L Coyote V8 (Mustang GT).
The Mustang is being made by Ford USA at the Ford Flat Rock factory in Michigan and it is expected to be released in the second or third quarter of the 2019. We expect this generation to last at least until 2023 and that after that the 7th generation will come.