Some details on Heavy Rain finally emerges

On Locations:
"I don't want to do a big free-roaming city like GTA, because the flow of the story will then be hard to control. Nevertheless, I do want to incorporate big sets, with a crowd, heavy populated areas like a mall and a subway are going to be in there. Of course, the gameplay has got to make use of that aspect too."

On Graphics:
"People will be surprised. Internal (Sony's) feedback on graphics has been great. This is going to be a truly next-gen game. But still, we want to do something unique with the graphics, going beyond just making the most photorealistic world we can."

On Gameplay:
"With the release of Fahrenheit, we gave the adventure genre a new grammar. We brought new ways into the genre, new words if you want to see it like that, a new vocabulaire. With Heavy Rain, where going to expand on that same grammar."

On Story:
"Heavy Rain is about normal people that have landed in extraordinary situations. I wanted a much more personal story. The first thing that came to my mind, as a father of two little boys, was that the main theme should simply be a father's love for his son. This is not a game about saving the princess or the world. Its purely about a father's love."

"The main story will revolve around 4 different characters, and we're putting the spotlight on their perceptions. The question 'what is good and what is evil' is the key here, that will be just a matter of viewpoint...I believe heavily in moral choices, I'm going to use them A LOT. They're not about being good or bad, but about finding the right balance."

New Heavy Rain Details Spilled, Lapped Up
Quantic Dream interview over at Overgame.com
Heavy Rain - Tech Demo "The Face"