So, it looks like the opening of the movie will be 3 pieces. 1 will be the creation of the New Order that I'm guessing the Empire folds into after losing the Battle of Endor and likely losing many battles after that. New leadership is formed and a new army is raised. From this final trailer, it looks like on the snow planet they are protecting something, something with trenches. Could it be a new super weapon? This new villian I guess went on a hunt for the remains of Vader and built a sort of shrine out of it and is hell bent on finishing what Vader started, which was the erradication of all known Jedi. No doubt he has no clue that Vader turned back to good at the very end. Luke probably didn't tell too many people that. I'm wondering who trains him, if anyone. Maybe he finds the old remains, trains himself, and creates his own makeshift saber.
The 2nd part is what is going on with Finn. It looks like he was born and raised as a soldier of the Empire and trained to be a Stormtrooper. Perhaps one day he learns of the new Sith being formed and hears / see's something he just doesn't like. He steals a Tie Fighter from the Destroyer he is on and makes a run for it. Queue the scenes of the Tie Fighter inside the hanger blasting away at Stormtroopers. Then the scene where the Destroyer clips the wing of the Tie Fighter and he is sent tumbling down to Jakku. He lands on Jakku and queue the very first shot we ever saw in a trailer, him popping into frame breathing heavily. He is lost in the desert and stumbles across the little village that Rey either works or lives at. I'm thinking Rey is out scavenging the Star Destroyer remains when she sees the Tie Fighter crash and races back to town to inform everyone . Either she goes and finds Finn or Finn stumbles into the place. Him doing so brings the New Order down on this place and queue the scene where we see the Tie Fighters destroying things while Rey and Finn run away. Tragedy strikes as most likely someone Rey loves is killed in this attack.
The main question is where does Han fit into all this. Is he Rey's father and when he is informed by Rey of what is going on ( or has sensors and detects the Star Destroyer and Fighters incoming )? It seems like either Han comes to Rey and Finn's aid or Rey and Finn somehow escape the carnage and make it back to Han. So they all, including Chewbacca, go to where the Millinium Falcon is and board it. Queue the escape sequence involving the Falcon and the Tie Fighters going through the ship graveyard.
The last trailer seemed to have a bunch more story pieces that kind of piece together a few other things. Like Rey ( im guessing who that is at the very beginning ) seemingly inside a crashed vehicle, quite large, im guessing the star destroyer or another big ship in the graveyard area. But why? Does someone tell her something is there worth searching for? And then you have Finn who is suddenly a part of the Rebel fleet section, dunno how that happens. I'm guessing he lets them all know he is a great pilot or something. Maybe he is in the fight at the end parts of the last trailer and crashes and is sensed by Kylo Ren and confronted. Maybe.
My guess is Finn is not force sensative but someone comes across the Saber he is holding. Maybe he is Force Sensative though, just with absolutely no idea and no training. As I thought Kylo finds him due to him having some strength in the force. I think Rey is the one who is REALLY powerful in the force and who will be the main character of the films. She seems to mirror Luke's intro exactly. The pilot I'm thinking is Han's kid, but who knows, and could potentially be force sensative too, but doubtful.
So while the opening is going to be 3 different sections. Somewhere they all come together in the end, in classic star wars fashion.
In the end, it is all incredibly intruiging and looks to be a great film. CANT WAIT