A demo of Quantic Dream's Heavy Rain will be available for download on the 11th of February, according to Mike Kebby from the Playstation Store. Kebby made the comment on a thread about PS Store's update, which was released yesterday.
Heavy Rain will be released on the 26th of February and we can expect a cinematic adventure where we'll be presented with the chance to play as several characters, with their lives intertwined as they search to unravel the mystery of the Origami killer.