The one shown in most of the images is a mockup that's been floating around for at least a year. But even if this was the first I was seeing it, I could still tell you it was fake by the fact it has both a D-Pad and a + button of the same shape which would cause too much confusion. The it's a pretty safe bet the + button on the real thing will be a circle with a "+" printed on it, like on the Pro Controller.
I've never seen the one featured in the image with the shell, so there's a chance it could be legitimate, but I remain skeptical.