On Reddit a photo of what appears to be an engineering card from Nvidia surfaced. The interesting part is that if you zoom in at the memory modules, you'll notice it has Micron GDDR6 memory. Since no existing GPU can work with GDDR6, this has to be a next-gen board. 

The photo is telling a lot, but then again little as this might not even be an engineering board, but rather a validation card to check out things. Interesting, however, is the placement of GDDR6 VRAM listed here, and of course that NVIDIA branded PCB.

Honestly, we can't say or tell if this is Turing whatsoever. I mean Nvidia could be working on a Pascal upgrade with GDDR6 right? This is a prototyping usually fitted with everything maxed out, like the three 8-pin power connectors, the 12-modules of Micron’s GDDR6 memory (indicating 12GB graphics memory). As you can see, there isn't any GPU present, the one that fits there is big though.

Being a dev board, it's not clear as to what this is and where the photo originates from, other than the post on reddit.

Photo of a NVIDIA GPU Engineering Board fitted with GDDR6 Spotted