A confusing thing has happened in Metal Gear Solid V: The Phantom Pain recently. The nuclear disarmament cutscene was officially opened for PC players, and no one — including Konami — is sure why. This cutscene hasn't been any secret to Metal Gear Solid V fans over the years. It was even released in full on YouTube by some people in 2015.
This nuclear disarmament cutscene was not meant to be made available until a certain requirement was met within Metal Gear Solid V: The Phantom Pain. In the Forward Operating Base multiplayer mode, all players (around the world) would have to decide to disarm their nukes at the same time. In doing so, worldwide peace would be made, and the cutscene would be unlocked for everyone on that platform.
This has absolutely not happened, as proven by Konami officially, and unofficially through the fan-created Metal Gear Solid V Nuke Watcher. The world of Metal Gear Solid V: The Phantom Pain players didn't suddenly find Ghandi or read up on tactics for world peace. There was a drop in nuclear weapons count in Metal Gear Solid V this January, but most are writing it off as fake.
Different theories have arisen as to why this nuclear disarmament cutscene was unlocked before its time. Some think that one person or a group of people found their way into Konami's servers and altered the nuclear weapon count to zero. This would of course unlock the cutscene and forever end the “what if” conundrum in Metal Gear Solid V. Other fan theories include the thought that it might have just been a simple accident on Konami's part. Or that perhaps they did it as a way to get more eyes on the Metal Gear franchise in preparation for Metal Gear Solid Survive's release.
On their official Metal Gear Twitter, Konami has assured that they are investigating how this happened, and that they will have more information to share soon.
Source: Metal Gear Twitter via Eurogamer