In terms of third party stuff, it's fairly obvious what will be there.
Locks:
Battlefront gameplay reveal
Street Fighter V
Arkham Knight launch trailer (or some sort of new footage)
Destiny's First Comet
Possible:
Persona 5
Tony Hawk Pro Skater
Mad Max
Dead Island 2
I know many want to see P5 there, i'm certainly one of them, but the chances are probably slim. And that's not going to be a lack of trying on Sony's part, it's probably going to have a lot more to do with the fact that Atlus is releasing P4D in Japan a week after E3, and that's going to include new footage. Still, it's possible that they could show something. Heck, i'd be happy with no footage and an exact release date considering how soon after E3 we'll actually be getting new footage.