It’s to be expected that a new trailer will produce more questions and even more theories. Some of them are fairly conceivable, others are wild, baseless speculation. I’m going to explain my theory as to the plot (and subplots) of the next movie based on evidence shown in the newest trailer. (If you haven’t seen the trailer yet, then you’re a nub and you should go watch it now – I’ll wait.) All right, now let’s proceed.
The Plot
A very Obi-Wan-esque image of Luke
The Empire is shattered. The Sith and Jedi have vanished and are now mere legends. Granted its only 30 years after the second Death Star was destroyed, but since there were technically only three Force users (Vader, Palpatine and Luke), its conceivable that most people weren’t even aware that Luke was Jedi and Vader and Palpatine were Sith. Be that as it may, Kylo Ren and his followers (the Knights of Ren) set out to rebuild the Empire that, Kylo Ren believes, Vader wanted. Ren is obsessed with Vader, we don’t really know why. The First Order, in juxtaposition with Ren’s efforts, is the new Imperial army led by General Hux.
Finn is a stormtrooper (remember, after the clone wars stormtroopers were no longer clones but volunteers) who, perhaps, begins to question the motives behind the First Order and decides he has had enough. He is shot down escaping and crashes on the same planet as Rey. This planet also has the crashed Star Destroyer we’ve seen in images and trailers. It’s also where, I believe, we see Rey spelunking in the opening of the newest trailer. Perhaps she find something there. A device or some data that the First Order needs to continue to rise to power.
This is also where the lives of Rey and Finn become entwined. Perhaps they are both experiencing strange, latent abilities. The Force. They have only heard stories of Jedi and the Force. Perhaps they are the first of, what will be, a new Jedi Order. If that’s the case then Kylo Ren would want to prevent and/or destroy them. He talks of finding the last Jedi. Luke? Luke is likely in hiding, thus perpetuating the legend. Perhaps Luke will emerge from hiding to train Rey and Finn and rebuild the Jedi. He could become the new Obi-Wan Kenobi.