Whatever that is, I wouldn't say that "Apple accidentally leaked the iPhone 6." That looks more like someone stole some presentation information to put on the Internet.
THAT video is a recording of ANOTHER video....
The background noise sounds like a small room...NOT a concert/outside place. The sound is not spreading far...And the way the colors look like. Seems like an HDTV but not real life. The patters of the chairs do not look natural in the video. The lighting of it does not appear natural.