I'm going to make an educated guess that these models have actual facial underpinnings (muscles, bones, fat pads, etc.) that control the appearance and set limits, instead of just a series of mesh morphs. Until "The Mummy" animators could get away with hollow meshes; "Hollow Man" would have been far less believable without this step. FWIW I sorely doubt every scene was shot using these mega-hires textures and bumpmaps; this is more likely for closeups and publicity. Likewise, the Ananova you see on the cover of "Lightwave[6]" isn't the Ananova you see on the website; that's (believe it or not) the Posette mesh you see talking. My guess is that Digital Animations realized they couldn't render five minute spots of the ultra-hires mesh in enough time to meet deadlines and commissioned a low-res stand-in they could animate more readily. Ananova and DA won't admit this, but there's ample proof out there.