I saw a special about Tatiana's double (whose name I'm forgetting)
She has more than one, in "making of" that I've seen. But surely one primary one.
Colin tried to remove all the magic from that for me by over-explaining, in even more detail than the making-ofs, but when I pointed out we could tell when she was one clone pretending to be another clone, he pretty much nodded and gave props.
Which--the effects are good, but they've been working on those for a long while now. What Tatiana is doing is much rare, and I'm going to assume much harder, judging by the number of actors with 3 expressions and 2 characters.
It sounds like what they are going to do is something similiar to what the Orphan Black special fx crew uses
I'm assuming it will be way more sophisticated than Brandon Lee (how old are we???) but it will be morbidly interesting to compare it to the final Hunger Games.