I am hoping for a somewhat scaled down hairworks option that is enabled on everything. Kind of a middle ground between melting gpu's, and plastic mosnters.
Using 1080p, a gtx 980 msi gaming @ 1500Mhz mem+200mhz, with the Witcher 3 game ready driver, with everything on ultra except foliage distance and shadows on High, walking around keeps it at 60fps, and when a group of hairy hairy wolves attacked, the framerate dropped to about 54-56. Not halved by any measure, but still a noticeable drop in fluidity.
I didn't test the differences, but I am running it on PCI-E 3.0 x16. I've seen other games, Ryse, Wolfenstein gain a fair amount of fps going from 2.0 x8 all the way up to 3.0 x16. don't know if that is the case here.