This is a combination of analysis of the trailers, leaks, rumors, and speculation found on the internet.
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The movie title refers to the Force becoming more powerful. It has been said that Luke Skywalker has become too powerful and too dangerous with the force, and has gone into seclusion. He might be protecting some Sith artifact or temple because he does not want the Sith to get to it. We know that R2-D2 is with him.
An unknown queen, most likely
Leia Organa, gives
Poe Dameron a special mission. The speculation is that it is to find her missing brother, Luke Skywalker.
Early in
The Force Awakens, hot shot rebel pilot
Poe Dameron, played by
Oscar Isaac, is a prisoner on an Empire ship. He escapes, possibly in a Tie Fighter. He shoots up a docking bay. Storm trooper
Finn, played by
John Boyega, is seen on a ship fearful for his life or at least very stressed. At one point Finn may participate in an attack on a forest world, possibly
Endor, because we know that
Warrick Davis is going to be in the movie, which lead to speculation that he would be reprising his role as the
Ewok Wickett Warrick.
Finn deserts the Empire and crash lands a tie fighter on the desert planet of
Jakku. Perhaps it was Finn who shot up the docking bay on the Empire ship. On Jakku there is a scavenger hunter,
Rey, played by
Daisy Ridly. She salvages from space ships that have crashed on Jakku from
The Battle of Jakku. Finn and Rey team up, along with her droid
BB-8 and get chased by the Empire.
Finn and Poe Dameron might be force sensitive.
Somehow Luke's original lightsaber is found. This is the one that he lost when his hand was cut off in
The Empire Strikes Back. Maybe Rey finds it because she is seen holding it, but Finn is seen using it. Together they might go on a quest to return it to its owner. It has been said that the movie ends with them finding
Luke Skywalker and handing the lightsaber to him.
We have seen C3PO with a red replacement arm.
Finn and Rey board the Millennium Falcon and pilot it. Han Solo and Chewbacca also end up on the ship with them, possibly because Finn and Rey stole the ship.
The main bad guys are Snoke, Captain Phasma, and Kelo Ren.
Kelo Ren is a member of the Knights of Ren, and sees himself as a hero figure. It has been said that he finds the mask of Darth Vader, becomes obsessed with Vader, and constructs a mask for himself. Kelo Ren is seen with a special light saber with a
cross guard. We know that Kelo Ren is not his original name.
There has been much rumor and speculation that one or two of the following are the offspring of Han and Leia: Rey, Poe Dameron, and Kelo Ren. We know that Han Solo confronts Kelo Ren and is possibly killed. Afterwards Chewbacca and
Lando Calrissian are seen piloting the Millennium Falcon.
The last names of Finn and Rey have been kept a secret, because it has been strongly implied that they are related to other Star Wars characters.
Captain Phasma appears to be a chrome plated storm trooper, and is played by Gwendoline Christie. She may be a bounty hunter.
Numerous characters, creatures and droids from the original trilogy appear in this movie, including
Admiral Ackbar, and
Nien Nunb.
Domhnall Gleeson plays
General Hux who commands a "Star Killer Base." Rumor has it that this is a weapon that can destroy an entire solar system.
It has been rumored that we would see an
Inquisitor, and this seems likely because of the emphasis on Inquisitors in
Star Wars Rebels. Some have wondered if this would be Kelo Ren.
There has been speculation that Luke Skywalker has restarted the Jedi Order and we might see Jedi in training. There also has been much speculation about the movie having "force ghosts" of previous Star Wars characters, including Anakin Skywalker and Emperor Palpatine.