It's easy to get 60FPS on mostly ultra settings 1080p, with a 970 , even with my i52320 CPU, just turn down shadows to high , maybe grass density to high, and crowds and draw distance to high, and hair works off. That leaves ultra textures and everything else like water on ultra, and it runs at 60FPS for me and looks amazing.
I can't even tell the difference turning down those other things to high to be honest, it looks the same as ultra to me, this game is more GPU dependant than CPU I think, so as long as you got a decent CPU, and a 970 with 8GB ram you are good to go. I have a second 970 but I don't have the motherboard or a better PSU to use it in SLI yet, that will be my next project when I get the money.
But so far, more than happy with my 970, it's a beast of a card on 1080p. Can't wait to try it with Batman and Fallout 4.