The Birth of the Rebellion
As we well know, Jedi: Fallen Order is set some five years after the events of Revenge of the Sith. At this point, the Galactic Empire would be well established, however the early pieces of the Rebellion would be clicking into place.
The first gameplay footage confirmed the inclusion of Saw Gerrera, an extremist working in tandem with the Rebellion. It would certainly be interesting to see just how the Rebellion began to mobilise in a violent manner.
The Force Unleashed (2008) gave us an insight into how the Rebel Alliance came to be, and it would certainly be welcome to see a return to that type of story.
As the new canon has taught us, it would be over a decade before the Rebellion became much more than a small militia faction, but to see Cal Kestis playing a part in the sowing of those very early seeds, and giving further context to the struggles of the Rebellion, would certainly be a story worth experiencing.