Seprated into categories of what we can expect
Expected
The Order Gameplay Demo
Uncharted 4 Trailer
The Last of Us Complete Edition Release Date
Indie Games Galore (Shadow of the Beast, Rime, Giant Sparrow Game, Tarsier Studios)
Destiny Gameplay Demo with Beta Date
Planetside 2 Trailer
Batman Arkham Knight Gameplay Demo (perhaps exclusive DLC)
Assassins Creed Unity Gameplay Demo or Trailer (perhaps exclusive DLC)
Surprising but not out of the question
PS1 and PS2 Classics
Media Molecule New IP
Guerilla Games New IP
Qunatic Dreams New IP
Sony London's New IP
Sony Bend's New IP
Project Beasts
Uncharted 4 Gameplay Demo
inFamous Second Son DLC
The Last Guardian
LittleBigPlanet Hub (now also on PS4)
Until Dawn Morpheus Edition
Beyond Director's Cut
GTAV
Dream Scenario
Dark Cloud 3
Crash Bandicoot 4
The Last of Us 2 Teaser
Shenmue 3
Agent
Sony Japan JRPG
3rd Party Exclusive Megaton