pablumatic said:

DavidMerrick said:

Well Hamill said he grew out a "contractually obligated" beard, which could be a joke but he was sporting one for all of filming. It doesn't make sense that he'd go full cyborg and lose everything that makes him identifiable as a character.

Provided Abrams' version of the Sith go by the master and apprentice rule, perhaps cyborg dude is the master.

Right or wrong I'm going to stay with the Luke is the cyborg speculation and consider the beard an official misdirection. The next trailer could likely prove me completely off-base. :)

I think the cyborg aspect may have just been pre-production concepts for Adam Driver's character that they decided to discard.

At some point, maybe someone in production thought that seeing Adam's face as opposed to a cyborg worked better.

I really doubt the cyborg is Luke. In fact Luke is probably just a cameo at the end of the film along with the flashback sequence earlier in the film where he's younger (that scene in the trailer).