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New Star Wars 'Rogue One' trailer rides the rebellion

Join the rebel forces in a surprisingly optimistic "Rogue One" trailer packed with hope, explosions and just a hint of Darth Vader.

Warning: if you don't want any "Rogue One" spoilers, don't watch this trailer or read this article.

The concept of hope runs through the latest "Rogue One: A Star Wars Story" trailer. It's a trailer for underdogs, for people banding together against a seemingly insurmountable force. It's a time for rallying speeches and coming together with our heroine Jyn Erso (Felicity Jones) at the center of a growing rebellion against the evil forces of the Empire.

The trailer packs a lot of details into its under-three-minute running time. We delve into Jyn's past, issues with her Death Star-building father (Mads Mikkelsen) and the origin of the "Rogue One" name. It turns out that "Rogue One" is an off-the-cuff stab at a cool call sign.

Of course, this is still a Star Wars trailer and we get some of the required epic battle scenes, explosions and views of fighting stormtroopers. As with the previous trailer, there's a glimpse of Sith Lord Darth Vader and his signature heavy breathing. Vader also figures prominently in a newly released film poster.

There are two lines that sum up the entire trailer: "Rebellions are built on hope," Jyn declares. The other comes from Saw Gerrera (Forest Whitaker's cyborg-ified character). He calls out, "Save the rebellion! Save the dream!" And save the date. "Rogue One: A Star Wars Story" opens worldwide December 16.