2K and Hangar 13 detailed the post-release DLC that will be coming to Mafia III. This includes both free DLC for everyone and paid DLC for those with the extra spending cash. The paid DLC is part of the Mafia III Season Pass, purchased separately, or a part of the Mafia III Deluxe Edition or the Mafia III Collector's Edition.
FREE! All New Character OutfitsNew, FREE WeaponsMORE Vehicle CustomizationFREE RACES!MORE STORIES FROM NEW BORDEAUX
Fast cars, dramatic chases, and stunt driving take center stage as Lincoln joins forces with his former flame, Roxy Laveau, to take down a corrupt Sheriff terrorizing Civil Rights activists on the outskirts of New Bordeaux.

If purchased separately, the DLC will run you $39.97 (USD) or $29.99 for the Season Pass.