I finally had a chance to see how it runs on my machine.
i7 5820 @ 4.1 Ghz (that's as far as she'll go I swear) and SLI GTX 970s @ 1500Ghz Core clock. Not the highest end but it's up there.
Everything maxed except 4x MSAA, 1080p. Cut scenes drop as low as the mid 40s so far. Gameplay in the first town has been between 50-75 fps (I know Paris is where the real performance issues become apparent). One thing this game has shown me is GSync is fucking awesome. Aside from the occasional big hitch, which seems to happen after covering a lot of ground quickly, (must be streaming data from disk), despite the fluctuating framerate, the motion stays smooth. However, I've played games that hover in the 50s before on my previous machine and monitor, and I know it never feels great to deal with tearing or judder.
Like the pictures posted here show, the high detail areas around the player character look amazing and the cutscenes as well but the level of detail drops off so quick and the pop in, so close, it's a shame. There's some other graphical oddities as well. One big thing is switching camera angles quickly results in like a brief flash, like it's figuring out what it needs to render. It ends up being inconsistent graphically but I think the art is top notch. I really wish it were more technically sound.