Well, I just played the game for about 2 hours and maybe it's too early to tell, but so far so good.
The game stuttered a little at the intro, but that was probably because I had 4k DSR on. As soon as I changed res to 1080p and everything on "max" including Gameworks all 4 options on, the game was a steady 30 fps. Including driving batmobile. Everything was just smooth with no issues.
Last half hour I increased DSR 2x, turned off smoke effect and it still was 30 fps smooth. Here is hoping it lasts, cause it looks and plays great so far.
Have a 970, SSD, 4790k, win 8.1, 8GB RAM.