Not even close. With the current generation we went from 28nm to 14nm, thus the huge shift in performance and even then it took a GTX 1070 to match a GTX 980ti.
Ampero would be a refinement of the current gen, with GDDR6 probably replacing GDDR5x on the high end and GDDR5x replacing GDDR5 on the mid range and possibly low end.
So 2080 is likely going to be as fast as the 1080ti at a $550 price point. That is going to be the advantage of the 2080. Don't expect the 2080 to be faster at all or have much better power consumption either, the shift from 28nm to 16nm happened, now its just going to be improvements until we see 7nm and 10nm. My guess is the 2080 will have maybe 20W less power consumption and be as fast as the 1080ti at a lower price point.
But again why would Nvidia essentially sell a 1080ti at a lower price point? So chances are we are going to wait quite a while before next gen is introduced. My theory from the start was about mid Q2 2018 with the high end products like the 2070 and 2080 hitting first, followed in two weeks by the 2060 and 2060ti, then two to three weeks later the low end 2050 and 2050ti, then probably about one month later the Titan XXL hitting the market, sooner than ever since Nvidia wouldn't want to sell the 2080 at $550 or $600 whatever they decide for long, so a Titan XXL at $1000, followed by a 2080ti a month after than at about $750.