To be honest though, thinking about the conference as a whole I don't think Sony really needs a massive amount of 3rd party exclusive announcements. It'll be 2 hours of mostly new game announcements / next gen footage and console talk and that's exciting enough.
We're likely to get in the space of one conference -
New footage of:
- Infamous Second Son, Killzone Shadow Fall, Knack, DriveClub
Announcements / gameplay / trailers for:
Sony Santa Monica's new IP, Media Molecule's new IP, Ready at Dawn's new IP, The Last Guardian PS4, Final Fantasy XV (supposedly exclusive)
Then there will likely be a couple of multi-platform games with exclusive DLC
And maybe one other big game announcement to end the show (My bet is on Kingdom Hearts 3, Uncharted 4 or Agent).
That's a fairly safe scenario and it's full of great and mostly exclusive content.