At Gamescom, Sony announced a brilliant new title currently called Rain (it's a working title), where an invisible boy can only be seen by the mercy of rain. I dare you to be disinterested after watching the above trailer, edited to Debussy's Claire de Lune.
I hope that "Rain" is changed in due time, in part because it's too direct and because the search results will be crowded considering its conflict with "Heavy Rain". More people need to know about this game.