Thanks for the link. I think I can provide some background why cloning will produce a much more animated animatronic:
There are dozens of muscles in the human face. The combined movement of these muscles produces an almost infinite range of facial expressions. This new animatronic will have what looks like about a dozen little "deformation" points in the face, probably little linear actuators or something, much, much, more complex than what animatronics currently have.
If you look at figures like Lincoln, yes he moves his mouth and eyes, . . . but the expression is always solemn. Similar to how some animatronics in Pirates are always jovial/drunk.
With this new technology, the animatronic can alternate between a grimace, laugh, . . . a whole range of emotions! They will obviously use actors, maybe well known ones, and have them act out a short scene. For example, the auctioneer in Pirates could be smiling, then get real nasty when he thinks somebody is stealing his rum, and then laugh. It will add deep to an attraction, but you could also have much more realistic shows like Hall of Presidents, only the characters could almost put on a play, which requires a range of emotions.
Also, the materials science is beyond what they currently have in the park, they are making sure the latex matching what the actor is doing.
Exaggerated expressions can, and will, still be used because actors are experts at making things look good theatrically.
I think that reason why they made the latex mask, instead of just doing a mould, is that it looks like they need to vary the thickness of silicone, to help make "wrinkles" and probably so that the little pullies, or whatever the actuators attach to, can properly deform the mask. A lot more complex than a simple mould, really amazing actually. A simple mold would be more, or less, uniform thickness and wouldn't deform in a predictable manner when the actuators are doing their job.
Plus they want the computer generated model to exactly match what is physically made. I would assume that a mould of a person's face would have imperfections, and such, and this might be enough to effect the final product. Also, a computer, I guess "printed" mould, means that one actor could do the face movements for several different looking animatronics.