The film, formerly titled Labryinth, stars Depp and Forrest Whittaker, and was supposed to open in North America on 7 September via Global Road Entertainment.
Directed by Brad Furman, the film follows LAPD detective Russell Poole [Depp] who is investigating the murder of Notorious B.I.
Depp also recently settled a $25m fraud case against his former business managers, a month before the trial was set to begin.
G, also known as Biggie Smalls, a year after the murder of his former friend-turned-rival and fellow rapper Tupac Shakur.