So Hideo Kojima has revealed that he has been working on Metal Gear Solid V all along. After showing two distinctly different types of games with trailers for both The Phantom Pain and Ground Zeroes, the legendary developer has explained how both of these games will fit together to form Metal Gear Solid V.
“Ground Zeroes is a prologue of Metal Gear Solid V. Nine years after that event will be “The Phantom Pain”. Metal Gear Solid V is constructed w/ prologue and main game “The Phantom Pain”. The game play demo I presented today is the opening of The Phantom Pain which is a tutorial that starts from crawling.”