Mercedes-Benz is out testing prototypes for a redesigned E-Class that’s expected to go on sale in 2023 as a 2024 model. The prototypes are for the regular E-Class, but redesigned versions of the E 53 and E 63 performance variants developed by AMG are also coming. In fact, our latest spy shots show a prototype for the new E 53. The E 53 and E 63…