It seemed like most of Quantic Dream's resources were poured into producing Heavy Rain, and while it would have been natural to assume they're singularly hard at work on something new, there's much better news to report: Quantic Dream told The Examiner it's working on two games.
"We currently work on two very different projects," said Heavy Rain director David Cage during the interview. "After the success of Heavy Rain, we continue to explore how we can go further with interactive drama, working on emotion and interactive storytelling for a mature audience, but with a very different story and a different approach. I think that people who enjoyed Heavy Rain will be surprised by what we prepare. Quantic Dream also explores how to use what we learned about emotion on Heavy Rain in very different types of experiences."
Pre-E3 rumors pegged Cage as working on a science fiction adventure called Horizon. However, there was no mention of the Horizon project or anything Cage is currently developing during E3.
Source: The Examiner