Wayne's personal ride is a Mercedes-Benz AMG Vision Gran Turismo. It's a little odd that he's getting a car that was introduced way back in 2013 for Gran Turismo 6, but it is a striking car nonetheless. It also was apparently too small for Affleck. As a result, Mercedes had to build a scaled-up version to fit the 6' 3.5" actor. This was to ensure he fit in the car, and the car's proportions weren't thrown off.
Two other Mercedes vehicles will appear in the film. One of which is a Mercedes-Benz E-Class cabriolet that will be driven by the character Diana Prince/Wonder Woman. The other is a Mercedes-Benz G500 G-Class 4x4², but Mercedes didn't specify where or how it shows up in the movie. You'll be able to catch all of the different Benzes on the big screen when Justice League hits theaters on November 17.