I am going with that its a clone, its got different injury's, no burn marks from being fried by palpatine. My dream would be he's a clone in say 30 aby or 40 aby or 130 aby. A legacy game would be fun.
Judging by his armor-suit its not imperial (it would have looked more gray-evil-communist) its not vader (would have looked more crude), its not the rebels (would have looked like 20 years old and have rebel inertia's all over it). So the big question is were is he?
Freude, schöner Götterfunken Tochter aus Elysium, Wir betreten feuertrunken, Himmlische, dein Heiligtum! Deine Zauber binden wieder Was die Mode streng geteilt; Alle Menschen werden Brüder, Wo dein sanfter Flügel weilt.