Here’s a lengthy presentation of Guerilla Games’s PS4-exclusive Horizon Zero Dawn. There’s an introduction and some PR hype, and then at about 4:35, the game begins. The intro video rolls, and live gameplay starts around the 7-minute mark.
The version above has more content to it, but is of lower quality. This one has the talky talk clipped, so that sucks if you’re into PR speak, but the video is better: