In the opening crawl for "A New Hope" that was released in 1977, we were given a primer for the premise of "Rogue One":
"It is a period of civil war. Rebel spaceships, striking from a hidden base, have won their first victory against the evil Galactic Empire.
"During the battle, Rebel spies managed to steal secret plans to the Empire's ultimate weapon, the DEATH STAR, an armored space station with enough power to destroy an entire planet.
"Pursued by the Empire's sinister agents, Princess Leia races home aboard her starship, custodian of the stolen plans that can save her people and restore freedom to the galaxy...."
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Apart from mentions in fan fiction and spin-off "Star Wars" novels, little more information is known about these "Rebel spies." Considering that the plans for the Death Star are pivotal to "A New Hope"‘s story line, it's about time a movie is devoted to their story. And their story looks thrilling. And there's not a Jedi in sight.
At least from what we can tell from this trailer, the movie is independent of the Skywalker canon and "mythical" Force, instead focusing on Jyn, a rebellious fighter who may have a problem with authority ("This is a rebellion, isn't it?" she says when her rap sheet is read out to her). There's hints of her compatriots and a powerful scene (that feels as if it was inspired by the "Star Wars: Battlefront" video game) showing Jyn and co. running at an AT-AT, blasters blazing. There's also some pretty cool hand-to-hand combat scenes. But there's little time for levity or needless lighthearted one-liners, this is war and we're going to live the grit of this war through the eyes of a brave band of Rebels who will stop at nothing to find the Achilles Heel of the Empire's superweapon before it goes online.
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Of course, we know the Death Star plans do get stolen and smuggled to the Rebels (via Princess Leia and R2D2), who then realize there's a small exhaust vent leading to the core of the Death Star that could be exploited. But what happened to to the brave team who captured the plans in the first place? We'll have to wait until December to find out.
For updates on the movie and its release, keep an eye on the official Star Wars website.