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I ordered mine (Silver/256GB) from a carrier (I'm switching my phone service to them, but my iPad is already with them). The website was falling apart so it was for Launch Day when I started, but by the time I was able to get the order completed it was something like 3-5 weeks. I'm not overly concerned though. I've had the new phone on launch day several times, and my current phone is only a bit over a year old so it'll happily keep me going. I don't mind waiting a bit longer, I'm sure it's worth the wait.
I doubt this relates to issues with the material. More likely, it is being done for the same reason as the Apple Watch: to hide the edges of the OLED Display when active and make the display harder to discern when off, by blending the bezel as seamlessly as possible into the black of the OLED Display. This effect is mostly replicated by the black iPhone 7 despite using an LCD, while on the White models a noticeable black edge exists around the display when active (and obviously, when it's off, it's all black). This relates to what Jony Ive was saying about Apple Watch at its debut regarding making it virtually impossible to discern where the physical object ends and the software begins. I can see them wanting to bring that approach to iPhone for the "wow" factor.
Sufficiently advanced technology, indistinguishable, magic, et cetera.