Alas it turned out to be a GeForce GTX 990M GPU for notebooks. It will be out in time for Christmas this year.
The N16E-GXX not really be boldly going anywhere and will be based on the Maxwell GM204 architecture. In short it is a GTX 980 card with a TDP around 100 to 185+W.
With a power supply like that keeping it cool is going to be a challenge apparently the chip is going to be soldered onto the motherboard, which is pretty retro.
Word on the street is that it will be closer to the performance of the current GTX 980M in SLI, which means slightly higher performance than a standard desktop GTX 980.
It could be priced twice as high as the current GTX 980M and we will know for certain in September.