It looks like Kojima Productions couldn’t wait for E3 to leak their trailer for Metal Gear Solid V: The Phantom Pain. The trailer which actually made its way on to Konami’s official YouTube channel was likely published by error.
While the official site took the trailer down almost immediately, it was up long enough for others to save it and re-upload it to the web. This trailer is obviously the Japanese version. It’s probably safe to assume that either Sony or Microsoft will be showing Metal Gear Solid V: The Phantom Pain during their E3 Press Conferences.
The trailer strangely lists game as “Coming in 1984”, hinting more closely at the timeline for the game, and has those who’ve watched the video already hoping for a 2014 release date. The Phantom Pain was originally slated for a 2015 release.