Parts of the story for "Metal Gear Solid V: The Phantom Pain" were left out of the final game, but Konami doesn't have any plans to release them as DLC.
Konami Has No Plans For Story-Based Content DLC For ‘Metal Gear Solid V: The Phantom Pain’ : Read more
Konami Has No Plans For Story-Based Content DLC For ‘Metal Gear Solid V: The Phantom Pain’ : Read more