From the official iPhone 7 page:
iPhone 7 dramatically improves the most important aspects of the iPhone experience. It introduces advanced new camera systems. The best performance and battery life ever in an iPhone. Immersive stereo speakers. The brightest, most colorful iPhone display. Splash and water resistance. And it looks every bit as powerful as it is. This is iPhone 7.
Immerse yourself in the gorgeous imagery. I was immediately drawn to the shiniest of the shiny, the jet black iPhone 7 Plus. I’ve gotten feedback that the matte black finish does a better job of hiding scratches and other imperfections, but I just love the look of this phone. I’ll be careful with it, I promise!
The Jet Black reminds me of my favourite iPhone, the 4/4S….the obsidian monolith has always been the one I like the most, and now this may be a good descendant.
I already think of the black finish as Batman version, and the jet black finish as the Darth Vader version.
That would make for a cool movie.