Various sources report that the official US Playstation site "accidentally" revealed details about a new Syphon Filter - Syphon Filter 4 - before quickly removing them again. According to the leaked details, the game is in development at SCE London, will use a brand new graphics engine and is scheduled for release in Q4 2012.
Did we mention that it's about a week left until E3? If you somehow missed that fact, let's say it again - it's about a week left until E3. Which probably means that the game will see an official reveal at the expo.