What's odd is that the graph that places the gtx 1080 above the titan x has an axis entitled "relative game performance" where the 1080 scres around 4.3-4.4, and the Titan X scores 3.6-3.7. That'd imply a 22% advantage for the 1080 over the Titan, not "twice the performance". It does use a lot less power so I'll grant the eficiency argument, I'm not doing the math.
They also say the 1070 beats the Titan, but they imply that it's not on all circumstances, so it's the same game between the titan/980ti and the fury x. It'd be safe to bet the 1070 will have titan x-ish performance. Which is impressive for the price, and the power draw will be even lower, I'm sure. The difference in performance between x70 and x80 cards is never incredible, which also leads me to believe that regular gaming performance for the 1080 won't be that far above the titan.
It's a decent jump in performance per price, and an impressive reduction of power for that performance... but it's nothing close to the impression and wacky numbers they're throwing around.
I'm waiting to see Polaris, they won't launch high-end first, so it'll be sometime before we can do a proper comparison. On the one hand the 1080 has DDR5X, on the other Polaris has a 2nm advantage in lithography. We'll see.