At this year's Tokyo Game Show, Kotaku checked out Sony's new prototype headset. This latest trailer shows a bit of how the headsets mixes real world and video footage.

Experience the big-screen in private. That's the sales pitch for head-mounted displays. One would think that the only real areas for technological advancement would be in the screen resolution and the actual weight of the device. Introducing the Prototype-SR (Substitutional Reality), a new take on the head-mounted…