French site Jeuxvideo has announced they will be revealing a brand new title exclusively for the PS3 on May 7 (via Gematsu).
They will be holding a live stream where viewers will be able to see the game and provide questions and feedback (presumably in French).
There's some suspicion this will be whatever it is David Cage's studio Quantic Dream is working on (Kara is simply a tech demo, remember), but my money's on a smaller, downloadable title for the PlayStation Network. As the followup to Heavy Rain, QD's next game is probably going to be something Sony wants to announce on a stage.
Sony already has an announcement planned for Thursday (largely suspected to be God of War IV), so it looks like they're starting to build some hype for their E3 conference.
If only those conferences weren't so consistantly dissapointing.