According to VideoCardz, the shrouds are angular and polygonal. It checked the photo sources but did not found anything dodgy. It does seem to suggest that the Nvidia GeForce GTX 1080 and GTX 1070 are on a production line somewhere.

The model numbers make sense too, being a progression from the GeForce GTX 900 series.

Nvidia is expected to fully introduce its Pascal architecture at the GTC 2016 next week so as far as leaks go it is pretty much an 11th hour job. Still it is always nice to see things before we are supposed to.