All three trailers put into chronological order ("Return", "Hope" and "Deceived").

"Return":

Protected by the legendary Jedi Order, the Galactic Republic stood as a bastion of peace in the galaxy for a thousand generations. Several centuries ago, the greatest threat the galaxy has ever known emerged in the form of the dark Sith Empire. After a volatile war, the Republic emerged victorious and the Sith were assumed to be extinct. Nonetheless, the Jedi have maintained a constant vigil over the ancient Sith homeworld, to protect the galaxy from the darkness that still resides in the planet's tombs.

"Hope":

The Battle of Alderaan. The Republic's gravest hour. Recently promoted to Darth, Malgus launches the first of many surprise attacks that would become his trademark during the Great War, perfectly timing the assault with a feint that pulls the Republic fleet light-years away. Thousands of assault droids and hundreds of Sith set the heart of the Republic ablaze, and Alderaan's few defenders are swept away with ease.

Unknown to Darth Malgus, small groups of Republic Troopers are stationed on Alderaan, some recovering from wounds, others are awaiting orders. As these brave soldiers take to the forests and mountains to fight a guerilla campaign against Malgus's forces, the Republic fleet rushes back to repel the invasion. With time running out and Alderaan's capitol threatened, it falls to Havoc Squad, the elite Republic Special Forces unit, to coordinate one last desperate stand against Malgus' vastly superior numbers.

"Deceived":
Republic leaders have traveled to Alderaan to engage in promised peace talks with the Sith Empire. The most powerful Jedi have accompanied them to safeguard against an Imperial deception. The Empire's real motive, however, was simply to lure the Republic's strongest defenders away from Coruscant and set the stage for an audacious attack. Under the command of Lord Angral, the Sith fleet approaches the Republic's capital planet for the first time in centuries. In advance of the fleet, the strongest Sith Warriors have flown a stolen Republic ship into Coruscant's orbit. Their mission is critical -- to destroy the planet's defense grid mainframe hidden in the heart of the Jedi Temple.

This is a game? The graphics are amazing!