One thing is clear. The divide between the light and dark side is not as clear cut as it would seem. Luke appears to be dancing on that line. Is he still a light side Jedi, or will he succumb to the darkness. He is not the same celebrating Jedi that closes the Return of the Jedi. He is hesitant. He is afraid. He is angry. He is distant.
In spite of it all, I remain confident that he is doing more on that island than hiding. He could hide on any planet in the galaxy, but he chose the birth place of the Jedi order. He is studying. He is preparing. He is growing stronger. Most recently, he is preparing his Padawan to face their enemies. His role in the fate of the galaxy is far from over.
In light of the Official Trailer, I have no doubt that The Last Jedi is bound to be the greatest Star Wars episode yet.