I don’t think I’ve seen any demos of iOS 7 where the device being demoed is black. Certainly not on Apple’s iOS 7 site.
Of course this is partly aesthetic – the new UI is very heavy on whitespace and looks good framed on a slab of white.
However, I’m not sure how great all that stark brightness would look on a black device.
But what if we’re not seeing it all just yet. What if there’s one more thing coming in the final release – a visual style that matches the physical surrounds.
A “venom” suit as it were.