Rian Johnson, the director of the movie, spent more than four hours meeting "Star Wars" fans, taking selfies and signing attendee badges.
The character are involved from the previous film, "The Force Awakens", including Kylo Ren, Rey, Finn, Poe Dameron and the rolling ball of a droid, BB-8.
Mark Hamill's Luke Skywalker, who played a smaller role in the last episode, plays a significant part in this trailer.
Lucasfilms, the production company behind the massive Star Wars films have confirmed that the upcoming Star Wars: The Last Jedi will be the last time Carrie Fisher will be in the films. The entire poster is covered in a red wash, a color generally used to represent the dark side in the "Star Wars" universe.
"I only know one truth: It's time for the Jedi to end", says Hamill's Skywalker mysteriously, as images of the conflict of the film's narrative and epic space battles engulf the screen.
Fisher died in December but had wrapped shooting "The Last Jedi" before her death, and was honored with an emotional video tribute as the convention opened Thursday.
"I love her so much, man, I just adore her, and I connected with her first and foremost as a writer".More news: France election: Far-left Melenchon enjoys late poll surge
Lucasfilm President Kathleen Kennedy has confirmed that Carrie Fisher won't be in "Star Wars Episode IX", despite recent reports that they would bring back the actress' character of General Leia.
The late great Carrie Fisher felt like she was always destined to play Princess Leia and in a odd way it seems nearly fitting that it will be her last role.
Hamill told stories of visiting with Fisher and her mother, Debbie Reynolds, in NY and attending incredible parties at their homes in Los Angeles.
At the same event, Fisher's daughter, Billie Lourd, donned a Princess Leia-style dress and delivered Fisher's famous "Help me, Obi-Wan Kenobi" speech, remembering her mother's legacy: "My mom, like Leia, wasn't ever afraid to speak her mind and say things that might have made most people uncomfortable", she said.
The actor said he had admitted to Johnson that trying to capture "lightning in a bottle" again was a prospect that "terrified" him - and he was relieved to find the director felt the same way.
This prompted Kennedy to insist that Hamill was "Mr Modesty", and tell the audience: "He is so significantly important to this next film".