I seriously doubt that this is a black Kindle, but there is a slim possibility. Someone sent this to CrunchGear. It was taken in a coffee shop in Seattle.
It's much more likely that this is another large screen ereader. I also just find it implausible that (assuming it's real) Amazon would be so sloppy as to let the new black Kindle DX be taken to a Seattle coffee shop. Amazon is too good at keeping secrets. Trust me, I've been working to penetrate their web of deceit for some time now.