A potential leak may give us some idea what to expect from Respawn Entertainment's Star Wars: Jedi Fallen Order. The leak comes from Reddit, where a user claims to have seen a marketing presentation for upcoming Star Wars projects.
Jedi Fallen Order's main character is supposed to be a padawan named Cal, who survived Order 66, the Emperor's order to kill all Jedi in Star Wars: Revenge of the Sith. Cal apparently has a female mentor named Ceres, though the leak doesn't state whether she is a Jedi as well. There is also a mention of Inquisitors, the Ninth Sister, the Second Sister, and other characters from the Marvel Comics series.
The leak says Jedi Fallen Order is planned for a November release date. That lines up with statements from Electronic Arts that Respawn Entertainment will have multiple games launching by Holiday 2019.
Interestingly enough, part of the leak lines up with another Star Wars series, the recently-finished Star Wars: Rebels cartoon. In that show, Jedi mentor Kanan Jarrus takes a young Force-sensitive boy as his new padawan, during the period in-between Episodes 3 and 4. Kanan's birth name was Caleb Dume, changed when the young man went into hiding after Order 66. That backstory was detailed in Star Wars: Kanan, published by Marvel Comics.
Likewise, the Ninth Sister is an existing character, featured in the Darth Vader series by Marvel Comics. She is a member of Palpatine's Inquisitorius, Force-sensitive warriors sent to hunt the Jedi. Other Inquisitors, including the Grand Inquisitor, the Eighth Brother, the Seventh Sister and the Fifth Brother, featured heavily in Rebels. All of this would make Jedi Fallen Order a direct prequel to Star Wars: Rebels.
As always, this is a rumor, so take it with a grain of salt. The reason we're reporting these rumors is because MakingStarWars backed up the leaker's other details about Star Wars: Episode 9 and The Mandalorian series coming to Disney+. That site is relatively good with the information it reports, making the leak more credible.