Steve Jobs and Phil Schiller tell Ina Fried in an exclusive interview why the white iPhone 4 took so long to gestate:
It's not as simple as making something white. There's a lot more that goes into both the material science of it–how it holds up over time… but also in how it all works with the sensors.
Further, Fried paraphrases Schiller that "it turned out that there were a lot of unexpected interactions between the color of the device and various internal components. Also, like fair-skinned humans, white iPhones need a little more UV protection from the sun."
In other words, the white iPhone 4 is a goddamned ginger. [All Things D]