SilverWook said:
And as I've said before, Mark didn't get back into shape just for a glorified cameo.
I agree and do believe you're right, but it doesn't completely rule out that slight possibility.
No matter how long he's needed for the story, I see Hamill as a team player who's willing to do what is needed - losing a lot of weight and growing his self-disdained beard - so that he can be the best he can be for his iconic role. Sure they can use digital manipulation, but that's the sort of thing they don't want to do if it can be avoided at all.
I for one am looking forward to seeing enough of Jedi Master Luke Skywalker who is in good shape and kicking ass. I'm sure I'm not the only one either, so again I believe you're right :)