The copper color wasn't for a bling effect -- it's a symbol of energy efficiency. You'll notice the windows are painted, and per BMW, that results in less power used to regulate the interior temperature. The copper color comes into play because it's representative of the metal's excellent thermal conductivity.
Also, note the vehicle on the far right of the photo. The futuristic BMW is facing forward, while a Mercedes G-wagen is pointed in the opposite direction. It's a subtle dig, both because the G-wagon looks mostly the same now as it did 40 years ago, and because BMW and Mercedes have a history of gently trolling one another.