Such CAD files are sent by Apple to accessory makers in Asia ahead of the launches of new products, so they can have their products ready when the new iPhone becomes official. In this case (pun intended - read on), the CAD files these renders are based on are said to originate at a Chinese case maker, which apparently got them first.
Okay, introduction aside, let's see what's new. The USB-C port is finally making it to iPhones this year, as you can see, and as has been rumored a lot of times. Then there's the new design, which makes the frame a little bit curvier, and also seems to curve the glass into the frame. If this pans out, it will make the phone much easier to hold.
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