Here's a video of a person handling what may be the final backside of the iPhone 6. The alleged final production case matches the design seen in the masses of previous leaks, so... could well be it.
Here it is, complete with stirring music that matches the gravitas of the reveal:
Imagine that. That could be your hand soon. And there might even be a front bit and a screen to make holding it even more thrilling. [Apple Insider]