Meh, I expect it to happen. I'm already paying for PS+, it'll probably be rolled into that. It is incredibly hard to turn down eventually 20 million people * $50/year = ~$100 million/year for a company in Sony's position.
More importantly, it's hard to turn down that cash when your rival is doing it and no-one gives them bad press about it.
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Personally I'm expecting:
- GT6, last guardian (based on the latest trailer they seem fairly likely).
- a concrete example of the new controller in use (in a steering wheel, or maybe aiming?), along with an explanation.
- heavy focus on online.
- cross-platform play/streaming/interopability. (vita/ps4/ps3/psmobile etc).
- some form of video streaming/tv.
- some casual gaming involving the camera.
- a whole lot of numbers for shareholders.
- 3D gaming, 3D video chat.
There might be a google presence (android/googletv/google chat)... and probably more games shown (KZ4 et al)