It feels like a similar problem to realistic speech synthesis, and there have been some really impressive TTS demos recently.
Athough on that note, how come Google can produce these amazing speech synthesis demos, but Google Maps still sounds robotic when giving directions? Is there some big problem around generalizing or productionizing the technology? Is there some hidden trickery behind the demos?
http://www.indiewire.com/wp-content/uploads/2017/01/an1-2740...
Wonder how much of the uncanny valley stuff left is in our heads?
CGI is superb at creating indistinguishable still images, but animation is still riddled with problems.
No, Sean Young (the original Rachael) was brought in to consult, but the CGI face was superimposed on a stand-in, Loren Peta [1].
I saw the movie on Monday and wasn't impressed with the quality there; worse than Rogue One Tarkin and on a par with Rogue One Leia. As many others have opined in this thread, the technology's fine for stills but really, really not there for animation.
YMMV, obviously. I have a friend who made it about a third of the way through Zemeckis' 2007 Beowulf before asking "hey, why did it all just go CGI?", and that movie wasn't remotely aiming for photorealism.