A Geforce 980Ti is only 50% faster than a Geforce GTX 970. So of course the Geforce GTX 1070 will beat a 980Ti, and we should expect a Radeon 480X to be at least on par with a R9 Fury X.
Like JEMC said, a new architecture plus process shrink is a big thing. Historically it means twice the power.
JEMC, what GPU do you have now?