VideoCardz has the pictures, what you see below is a dual GeForce GTX 1080 from a Clevo P870DM3-G laptop. The cards use a custom PCB made by Clevo:
Some guys over at Baidu, got their hands on Clevo P870DM3-G, equipped with dual GTX 1080. They provided Furmark screenshot, GPU-Z sensor tab screenshot and picture of two GTX 1080 installed in the system. So these are probably the first photos of GTX 1080 Mobile. You can clearly see that this is not the MXM format, but custom PCB manufactured by Clevo (there are no NVIDIA labels).
As a bonus, the site also scored a photo of the N17E-G1-A1, which is the mobile version of the GeForce GTX 1060. The performance of this part is expected to be somewhere between the level of the GTX 970M and the GTX 980M.