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Dunno. Sony says that tonight they will allow us to "see the future".
The Wall Street Journal reports that the next PlayStation will indeed be revealed at this event. Let's see what happens tonight! I'm guessing if it's not the hardware they show us it'll at least be next-gen visuals, what to expect from the ps4, but not the console itself.
My biggest interest is mainly what's inside the games instead of what the hardware will look like, size of the worlds, AI, interactions... What new ways game devs will be able to improve games and what kinds of new features they can implement with the PS4.