[Vampyr]

Skynet manufactures the skin that goes on the cyborg. They just have to come up with a reason for skynet to want the cyborg to look like an older version of the original.

I just realized how awesome it would be if Arnold had a role, even if it's small, in the sequel to Predators (the Adrian Brody movie, which they've already pretty much confirmed they are doing). His age would actually fit the timeline, as Predators takes place several years after the original Predator (Arnold's character is even referenced in the movie).