A Dutch website has published a picture of DLCs it expects to see released in the month of March. It’s not known whether the list is purely speculative or whether it’s based on actual solid information about the downloadable content set to drop within the month.
According to the release page, Grand Theft Auto V is set to see the release of two free DLCs, including Assassination and Flight School. There’s no word on what these packs will actually be called, assuming the DLCs referred to in the leak are real. Presumably, the content will be used to bolster the already ample amount of content in Grand Theft Auto V's online mode, GTA Online.
Beyond those two DLCs, GTA V saw the release of the Business Pack on March 4, which added slacks, suit jackets, blouses, and heels, and business-like hairstyles to match.