Of course I'd love Sony to go huge at this event, announcing new games from all of their 1st party developers on the poster.
Let's face it, even if they did that they still have a lot of other 1st or 2nd party developers that aren't on the list that more than likely have games they could show off next year, like Japan Studio, London, Bend, Firesprite, Polyphony Digital, Quantic Dream are yet to unveil their new IP for PS4, so that could be a huge deal at E3 next year. The usual suspects of The last Guardian and Agent could be trotted out and actually given concrete details.
Really I'd actually prefer for Sony to be a bit conservative, bring new footage for Uncharted 4 gameplay, show off Ratchet & Clank, maybe the first glimpses of gameplay for Shadow of the Beast and maybe announce one new game from either Media Molecule, Guerrilla Games, or maybe Cambridge.
New footage or some kind of stage demo for WiLD and a release date for that along with a number of the other titles they've already announced would be good IMO. Focus on games that are definitely dropping in 2015 and announce specific details on when they're coming.
