Officially Metal Gear Solid V: The Phantom Pain will be released on 1st September. But, if you pre-ordered the game you can start downloading the espionage thriller on Xbox One. But of course, even if you can download the Digital Day One Bundle already, you have to wait more than two weeks until you can start into the (probably) last Metal Gear Solid by Hideo Kojima.
Metal Gear Solid V: The Phantom Pain will be also released on Playstation 3, Playstation 4, Xbox 360 and PC.