Jackie Brown is based on a novel by Elmore Leonard. That book is called Rum Punch, and it actually has a precursor story - The Switch. Calling it a prequel gets your attention, but it's wrong as Rum Punch is really a sequel to The Switch.
The Switch is about the younger years of two favorite characters from Jackie Brown: Ordell Robbie and Louis Gara, who in Tarantino's film were played by Samuel L Jackson and Robert De Niro. I haven't read the novel, so here's the Amazon description:
Ordell Robbie and Louis Gara hit it off in prison, where they were both doing time for grand theft auto. Now that they're out, they're joining forces for one big score. The plan is to kidnap the wife of a wealthy Detroit developer and hold her for ransom. But they didn't figure the lowlife husband wouldn't want his lady back. So it's time for Plan B and the opportunity to make a real killing -- with the unlikely help of a beautiful, ticked-off housewife who's hungry for a large helping of sweet revenge.
John Hawkes, our greatest modern character actor (and headed for an Oscar with his new film, The Surrogate), will be playing Louis. Meanwhile Mos Def - now going by the name Yasiin Bey - will be playing Ordell. Not a bad team up!
I wonder if the film will be set in the past, so as to make it line up with Jackie Brown, or if the adaptation will be its own thing. It's intriguing when an author like Leonard - who has weaved a subtle universe in his books - is adapted piecemeal like this. You'll remember that Michael Keaton appeared in Out of Sight, another Leonard adaptation, as the same character he played in Jackie Brown. The two films weren't officially connected, but the shared Keaton made a nice nod. Is Ray Niccolette in The Switch? If so, I wonder who could play him...