Part leaks feel like they've been much fewer by this point than for the 5s or 5. Is it possible Apple has kept the wraps on what the production device really looks like, and these "mockups" are total guesses based on prototypes?
I agree with you. Interestingly, a majority of folks have already made up their minds based upon these mock ups. I remember all of the mock ups for the iPhone 5, which did not look like the final product.