Motion capture is getting much cheaper very, very fast.
Case in point: Zign Track, which purports to do motion capture of markers on a face for $99 plus a webcam. The demos are impressive, although I’m not sure what Machinima packages aside from MotionBuilder would support imported facial data at present (UT3, perhaps?)
Having said that, now the capability’s there, the rest of the software may well follow.
Thanks to The Overcast for putting us on to that.