Today, a video entitled The Reload was uploaded to YouTube by the official PlayStation channel. Only fifteen seconds long, it shows a woman sitting in a dimly lit room, cleaning what appears to be an MP5 sub-machine gun. Her electricity fails, the lights begin to flicker, and the room fades into darkness.
The teaser ends with a link back to the PlayStation YouTube channel, and the date 10/23/12, suggesting that some sort of video will be uploaded on 23rd October, or five days from now.
Watch the teaser for yourself and see if you can glean any more details: