Though EA was expected to show the video during its live presentation, Respawn Entertainment has released the Titanfall 2 Single Player Trailer after a leak during EA Play’s Pre Show. The unexpected error led certain users on YouTube and Twitter to share pictures and GIF, but it took some time for Respawn to put the full, official trailer on YouTube, which was unavailable for some time. As of right now, the video is working.
According to the video description, the mentioned campaign “explores the unique bond between man and machine, players will step on to The Frontier as a Militia rifleman with aspirations of becoming a Pilot.”
[Source]: Kotaku: Titanfall 2 Single Player Trailer Leaks Ahead Of EA’s E3 Conference [Update].