Wearing just some camouflage wrap and the front and rear, it's impossible to hide some very specific styling cues that identify this as an AMG GLS 63. Mercedes-AMG GLS 63 Spy Photo CarBuzz/ValnetWe can also tell this is the high-performance AMG model by looking at the Panamericana grille. Mercedes-AMG GLS 63 Spy Photo CarBuzz/ValnetIf there was any doubt about this prototype being a GLS 63, it's erased at the back. The Major Changes Are InsideMercedes-AMG GLS 63 Interior Spy Photo CarBuzz/ValnetIf the exterior differences seem underwhelming, you will likely feel different about the interior. We can't talk about the Mercedes-AMG GLS 63 without at least some mention of what's under the hood.