Perhaps I missed it, but has the possibility that Pascal is a straight up die shrink of Maxwell been discussed? The delta between a 980 and 1080 can be explained entirely on cores and clock speed (25% more cores that are 42.5% faster with 75% clock scaling), and the same can be said of the delta between the 980 Ti and 1080 (10% fewer cores that are 50% faster).
Based on that premise, a 1070 is simply an overclocked 980, and with a core clock likely to be 33% higher and 75% scaling on that clockrate, the 1070 will be 1.25x faster than the 980, or about 5% slower than a Titan X.
To be a bit cheeky about it, this is similar to the rebadge of the 290x to 390x, but with the added benefit of a newer process.
Or to be more literal, this is the original Maxwell design, delayed 18 months or so.
6% sounds about right if you compare FLOPS.
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