A leaked image from canceled Star Wars game Star Wars 1313 seems to confirm rumors that it would have been about Boba Fett. The game was officially canceled in 2013, when Disney announced that it would be closing LucasArts, the Star Wars 1313 developer.
On Reddit, a user named LifeByTheSword has shared an image showing some sort of bounty hunter character standing on a ledge. The user says that it shows Boba Fett "in the underworld of Coruscant." The image also features Star Wars 1313's heads-up display, showing a weapon on the left and some sort of flame symbol on the right, though it's unclear if this is for an ability or if it's for another weapon such as a grenade.
The image seems to confirm rumors that Star Wars 1313 was a Boba Fett game. Rumors from around the time the game was canceled suggested that it would have shown Fett capturing characters like Bossk, another Star Wars bounty hunter. It looks like the game would have allowed players to go all over Coruscant rounding NPCs up. Star Wars 1313 gets its name from the 1,313th level of Coruscant, where Boba Fett was able to become the skilled bounty hunter.
Here is an actual in-game screenshot from the cancelled Star Wars 1313 showing protagonist Boba Fett in the underworld of Coruscant ... from StarWars
Other Star Wars 1313 concept art showed planets like Tatooine and Hoth. This is the only leaked screenshot from the game, so it's unclear if the LucasArts development team was able to start work on these other planets before it was closed by Disney.
Since Star Wars 1313 was canceled, several other quality Star Wars games have been released. Players are able to go to Tatooine and Hoth in Star Wars Battlefront which may not be a Boba Fett adventure, but it does show how much fun fans could have on those planets.
Fans have been asking Disney to complete development on Star Wars 1313 for years. Some wondered how the game could fit in with Disney's plans for the Star Wars movie series, but this was long before the release of the new Star Wars trilogy. This was also before Disney gave out the license to EA and confirmed that it no longer plans to develop its games internally.
However, a full release of Star Wars 1313 now seems incredibly unlikely. Star Wars has been a huge success for EA, and Star Wars Jedi: Fallen Order exceeded its sales expectations, so if there was going to be a new Star Wars single-player game, it would be Star Wars Jedi: Fallen Order 2 and not Star Wars 1313.