iPhone 5s prototype parts already being shipped to Apple?

Some former rumors on the internet said that Apple will release its 7th generation of iPhone in the first half of 2013. However, the latest news said that its released date will be some day next summer.
It is also rumored that the components suppliers of the new iPhone have already submitted samples to Apple and will trial-manufacture 50~100 K new iPhones.
When the media are still speculating the reliability of these rumors, a couple of rear housing pictures of suspected new iPhone were found scattered around the interwebs. There's a little more coverage here alongside more photos. Since the pictures show the aluminum with a rather bluish hue to them, are you looking forward to a more colorful selection of iPhones next summer or fall?