MG Siegler, TechCrunch:
It’s entirely possible that Apple decided to keep the focus on white and black (again, silver and slate) for the high-end model, while choosing more playful colors for the lower end. But some people, bored of black and white, may have opted for the 5C simply to add some color to their iLives. So the gold iPhone 5S (with a white front plate, one would assume) would seem to be a decent compromise in that scenario.
This is the most compelling argument I’ve heard yet for a gold iPhone. I certainly trust Apple’s taste, but remember that the gold iPod Mini was the shortest-lived colour for any iPod model. It, however, was far less subtle than the rumours surrounding this model.