GP100 (or possibly, GP102 without FP16) is clearly NV's answer to Vega, just like GM200 was NV's answer to the Fury X.
Vega will release early 2017 offering a solid X% performance over the 1080, then NV will release the GP102 as the 1080ti offering X+Y% at a better price/performance, then AMD will match it. That's just how it always goes.
Vega will release early 2017 offering a solid X% performance over the 1080, then NV will release the GP102 as the 1080ti offering X+Y% at a better price/performance, then AMD will match it. That's just how it always goes.