Mercedes-Benz in early June unveiled a redesigned GLC-Class that we’ll see in showrooms as a 2023 model, including in high-performance GLC 43 and GLC 63 AMG guises. A prototype for the new GLC 63 has just been spotted. The current GLC 63 and spicier GLC 63S are Motor Authority favorites, thanks to their aggressive looks, track-honed suspension…