This photograph of a Foxconn line worker working on what appears to be a yellow iPhone 5 is doing the rounds, with the suggestion being that Apple slipped up and accidentally leaked an upcoming colored iPhone on their System Reliability page.
I have no idea if Apple will colorize the iPhone 5S, but I can comfortably say that Apple’s not that stupid, and isn’t going to leak a photo of an upcoming product on their own website. That’s not a urine yellow iPhone 5S: it’s an iPhone 5 with a yellow protective coating to keep the bezel from being scraped or chipped during manufacturing.