This mobile processor would also feature 8GB GDDR5 memory across 256-bit interface, so just as desktop 1070. The leaked GPU-Z screenshots reveals all the basic specs. However be advised, TMUs count is incorrect (should be 128).
The site also writes the mobile version of the GeForce GTX 1060 will be almost identical to the desktop version. It has 1280 CUDA cores but slightly lower clockspeeds (Boost is reduced by 38MHz).