Game Informer has a great write-up today on the downfall of "Star Wars 1313" and LucasArts, headlined "Fall Of The Empire: How Inner Turmoil Brought Down LucasArts" (no longer online at gameinformer.com; archive.org version). Here's a relevant excerpt about Boba Fett in particular being a direct request by George Lucas, although it was after the game was already being talked about:
One of Lucas' most crushing curveballs came weeks before the game was announced. He didn't want the protagonist to be a fresh face; he wanted it to be Boba Fett. Without any working Boba Fett assets ready for the announcement, the team members who unveiled the project to the press during 2012's Electronic Entertainment Expo, had to play dumb. They lied when asked directly about it, unable to mention anything about the iconic bounty hunter being the lead.
The new direction for the game brought the title change of Star Wars: 1313, a name which Star Wars fans immediately connected to Boba Fett since he used the alias CT-1313 in the novel Boba Fett: Maze of Deception. The game was well received at E3, drawing many comparisons to the Uncharted series, the same franchise that essentially landed the killing blow on Indiana Jones.
Read the whole article at GameInformer.com (no longer online at gameinformer.com; archive.org version)
"Star Wars 1313" was abandoned after Disney bought Lucasfilm and there are no plans for it to be continued through to release.