(This is strictly a theory, However my theory will suggests how the new movies will not only continue the story but provide the origin and purpose of the entire saga.
Star Wars The Phantom Menace -
Darth Maul and the mysterious Sith Lord are learned of by the Jedi Council. Anakin Skywalker meets Jedi Master Qui Gon Jinn and his Padawan Obi Wan Kenobi. They learn Anakin was conceived by the Force and could be the prophesized one to bring balance to the universe.
Star Wars Attack of the Clones -
Obi Wan with his Padawan Anakin uncover Jedi Master Count Dooku is the new Sith apprentice Darth Tyranus.
Star Wars Revenge of the Sith -
Chancellor Palpatine convinces Anakin to kill Darth Tyranus and sways Anakin to the Dark Side and becomes Darth Vader. Palpatine is identified as the Sith Lord Darth Sidious. Vader during a debilitating fight against Obi Wan losing both legs, an arm and his entire body including lungs are scorched. Because of this he fitted prosthetics and the mask.
Star Wars A New Hope -
Luke Skywalker meets Obi Wan and begins his training to become a Jedi like his father who he's told was killed by Darth Vader.
Star Wars The Empire Strikes Back -
Luke leaves to help his friends Han Solo, Princess Leia and Chewbacca from being killed by the Empire. He faces Darth Vader losing his right hand and learning Vader is his father.
Star Wars Return of the Jedi -
The Rebel Alliance with Luke, Han, Chewbacca, Leia and Lando Calrissian attack the Death Star where Darth Sidious and Vader command the Empire. Luke reaches his father who kills Darth Sidious and Vader converts back to Anakin bringing balance to the Force.
Star Wars The Force Awakens -
Supreme Leader Snoke commander of the First Order and the Knights of Ren with his apprentice Kylo Ren. Seekout to kill Luke Skywalker the last living Jedi.
Why is killing Luke so important to (not Darth Snoke but) Supreme Leader Snoke?
Because Luke's the last threat in the universe that stands between him and ultimate "power".
Who's more concerned with power than anyone else in the Star Wars universe?
"Darth Plagueis was a Dark Lord of the Sith so powerful and so wise, he could use the Force to influence the midi-chlorians to create life. He had such a knowledge of the dark side, he could even keep the ones he cared about from dying".
"Unfortunately, he taught his apprentice everything he knew. Then his apprentice killed him in his sleep. Ironic. He could save others from death, but not himself".
BUT WHAT IF HE COULD AND DID!?
What if Sidious thought he killed Darth Plagueis and to keep Sidious from returning to finish him he stayed in hiding. Due to the damage to his body he could not endure another attack so to keep from being identified, he uses his origina name Snoke.
Here's the kicker... He wanted to kill Darth Sidious but could not do it himself. He would need a Jedi or Sith powerful enough to do so.
"He could use the Force to influence the midi-chlorians to create life".
HE CREATED ANAKIN IN THE WOMB OF SHMI!!!
The entire Star Wars saga Darth Plagueis intricate plan to kill Darth Sidious and regain his place as the most powerful in the universe.
Crazy but feasible...