I immediately latched onto how the opening was the same as the first teaser for TFA. Then noticed other similarities throughout. It's why Disney is Disney. They make you feel the feels without really knowing WHY you're feeling the feels.
I love Disney.
I hope they are not going down the path that the NJO books did with Vergere and the One Force theory. Where there was no light or dark side, just the Force and how it was used by the person made it Good or Bad.
The backlash to that was so intense, that they retconned the whole thing in the next series. I think this is a red herring, with Luke's "It's time for the Jedi.... To end" signifying his view at the start, with him coming around by the final act.
I'm also convinced that Rose, the Resistance tech whose actress they had at the panel and the introduced as a major character, is a FO spy. Pretty sure she's responsible for the hangar explosion. Also, Phasma is walking into that same hangar in her shot after the explosion, so it's ground based. I've seen speculation that it was a hangar in a ship, but I'm convinced it's planet based.
Also, we get a brief glimpse of the Jedi Academy burning, as Luke falls to his knees next to R2. Pretty sure this will be during the explanation of Rey's origin. Still betting that Kylo is the one who took her to Jakku.