Apple's corporate headquarters, PR megamachine and primary customer base are in the US. Their products, on the other hand, come directly from Chinese hardware manufacturers. Like Apple, they're good at keeping secrets. Unlike Apple, they're sometimes violent about it.
In writing an exposé on Apple's supply chain, Reuters' reporters fleshed out what we already know: There's an immense pressure on companies under contract with Apple not to leak any information about forthcoming products; said companies have shady labor histories; working for one of these companies frankly sounds terrifying.
We touched on these problems when Foxconn was accused of driving an employee to suicide over an iPhone prototype leak last year, but at the time, our picture of Foxconn was patched together from a pile of second and third-hand reports, conflicting local news stories, and PR spin. To date, there hasn't been a better illustration of the problem than this