It shouldn’t be Lumia 840 or Lumia 850, as it runs on Snapdragon 810, while Lumia 940 is supposed to come with Snapdragon 808. It can’t be the Lumia 940 too, as it has only 1080p display and again runs on Snapdragon 810.
But if you compare this prototype’s specs to the leaked RM-1106 variant at GFXBench, somethings look similar. The RM-1106 was listed with Adreno 430 GPU but with Hexa-core processor. Since Adreno 430 comes only with Snapdragon 810, it was a mystery and may be now this prototype solves that mystery. It may be running Snapdragon 810 only with 2 cores idle. The only worrying thing that emerges out of this comparison is the 1080p display instead of rumored 2K display. So, this muddies the waters again!!
Thanks Xio-Feng for the tip. Cheers!!