Where are all the black iPhones with iOS7?

During the keynote and in their website, Apple neglected the black iPhone 5 to display iOS7. I've heard that Jonathan Ive likes white iPhones and well, to be honest, iOS7 does look better on a white iPhone.

While browsing through the beta ios on my black iPhone, I noticed there's white EVERYWHERE. I am surprised Apple has used so much white througouht the interface considering white pixels waste more energy than black pixels. I'm not sure how much it would affect the battery life, but they should consider making a black "theme" for black iPhone users. This is my idea of the black iOS7. Tell me what you think in the comments!