And it's never coming out
Oh Star Wars 1313, you were the hope of so many Star Wars fans. With LucasArts no more, there's little hope of this Boba Fett adventure ever coming. What would it have been about? IGN was shown 15 minutes of a demo that would have been at at E3 earlier this year.
The game was to begin with a prologue set on Tattooine, taking place between the prequel movies and the original trilogies. Fett had yet to get his Mandalorian armor, but the pieces would come together as you advanced in the story.
As for the story, it would have involved Fett searching for bounties while working for Jabba the Hutt, going through 1313 and the mysterious 1314. The main plot point revolved around the crime families of 1313 using Tauntauns to smuggle spices to other planets.
Gameplay was likened to Uncharted's platforming, taking place on huge action set pieces. Which means there would have been scripted sequences and the like.
There's way more details on IGN, including how the game was actually going to tie-in to the live-action television series, plus a bunch of concept art.