According to an alleged "senior development source" inside developer Quantic Dream, founder David Cage will be announcing his studio's next project during Sony's press conference next week at E3 2012. Quantic Dream is best known for its quick-time event adventure game Heavy Rain.
The same source also alleges that Quantic Dream is currently working on two unannounced games for Sony. The source won't say what Sony platforms they will be released for.
Sony's press conference will be airing on Monday on the 4th June at 6:00PM PST (2:00AM GMT on Tuesday.)