I think the most likely things we'll see is Bend, Santa Monica and Sucker Punch finally showing what they've been up to since their last, big, internally developed games were released.
Let those stand on the stage, with significant amounts of real time PS4 gameplay that both gives a good idea what these titles are, while also getting people asking questions about them.
Announce all 3 are 2017 releases.
For Nostalgia London could re-reveal The Getaway or Eight Days as a PS4 exclusive.
Hold back on the 3rd party multiplats, just do a montage of the main ones that get DLC on PS4.
Give us great gameplay for titles already announced as PS4 exclusives, but waiting to come.
I think that would do it, just answers to the question of what 1st party Sony studios have been up to, delivered with major announcements and awesome gameplay of PS4 AAA exclusives. People would go mad for that.
If Sony can also add in some big nostalgia with titles that have been on hold for ages, then that would seal the deal IMO.
