Faster than 1070 is just a rumor. Also if u don't have a freesync monitor then Vega is useless for you. Also price to be much higher than 1070.
it was already kind of expected before the leaked benchmarks ...
Vega 56 vs Vega 64 is most likely going to be the same story as Rx 570 ( 32) vs Rx 580 ( 36 ).. 85% performance of VEGA 64 ..
and VEGA 64 is GTX 1080 performance ( taking FE performance + some driver improvements ) .. so there are very good chances of it ending up being faster than 1070 and then o these leaked benchmarks ..
AMD Radeon RX Vega 56 leaked benchmarks: GTX 1070 killer
ofcourse nothing is confirmed so take it with a grain of salt since this is AMD , and difference between 1070 and vega 56 may not end up being that large especially after overclocking 1070 but it wouldn't be surprising if it is faster than 1070 ..
and Fressync is the trump card for AMD.. freesync monitors are now widely available and popular ..
For Anybody building a new system , and those who already have freesync monitors that is the whole point of going for VEGA .. even at slightly higher prices than 1070 ( not counting these crazy mining influenced prices , and depending upon whether or not and how much faster vega 56 ends up in comparison to 1070 )
a lottttt of buyers have been holding off buying nvidia GPU's only because of Freesync
but whatever , unless mining cools off , it will not matter anyway