The trailer was around 10 minutes long and featured some impressive graphical capabilities of the Fox engine. However, as soon as Snake came into play, the trailer ended.
Now, an extended version of the video has been released and this contains a lot more gameplay. You can check out Snake as he puts his sneaking skills to good use and takes out the tower guard to clear his way into the prison camp. Later the video takes the action to both the ground vehicles and in the air.
This extended trailer gives us a better understanding of how big a scale the game is built upon. Kojima mentioned earlier that Ground Zeroes will be an open world game with a ton of places to explore and travel between.