I have a bad feeling about this
I'm not sure if you guys have kept track of this, but it seems as though ever since Celebration, Mark Hamill has been getting more.....vocal....about his thoughts and experiences with both TFA and Episode 8.
There are actually a lot of interviews on Youtube about this right now, but this one seems to encapsulate everything:
Now obviously, Mark has to do a bit of promotional dancing here. I'm sure that there are a lot of agreements in place that would prevent him from saying too much about it, but what he has said so far has been....not good. Reading between the lines, it's downright worrying. When you have Luke Skywalker's actor saying he "fundamentally disagrees" with the direction that they're taking his character in, my alarm bells go off.
What could this mean? We won't know until December, but if I were to guess based on Hamill's remarks as well as Daisy's remarks about "being disappointed by your heroes", i'd say that we will see the character of Luke portrayed negatively, possibly gone crazy or a danger to those around him, and likely dead by the end of the movie (also based on Mark's looser lips this time around and rumors that he's gaining weight again).
Whatever the case may be, I think it's almost 100% guaranteed that the hero we know from the OT and who we've been invested in for 38 years will either have his legacy tarnished or his character vilified in some way, over and above his failure of Yoda's hope that he restore the Jedi and his cowardice in running away from the problems of the galaxy and his friends and family (which is already bad enough).
I was not a fan of TFA at all, so that may color my views on this, but i'm feeling the small hope that I had for Episode 8 diminishing.