So who wants to guess last minute predictions about Sony's E3 Conference?
Here are my final bets:
For PS3 we will get a trailer for AC: Comet (considering this wasn't even shown off at Ubisoft's conference), KH 2.5 Remix, and a new trailer for Persona 5 (this might be one of the last 'big' games for the PS3, so they should at least acknowledge the tittle) alongside a 1TB PS3 with no Disk Drive (it will be pushed as a cheap PS+ console for PS4 owners), announcement of a new platformer by Sanzaru (either Sly Cooper or Ratchet), and some more HD collections (like maybe a Dark Cloud/Hot Shots Golf/Ape Escape one).
For Vita, my expectations are very low

. Proper announcement of the Ratchet Collection port alongside the Ico Collection and some third party one (Splinter Cell or Prince of Persia might work), the memory cards getting a 10% price drop + the 64GB one coming stateside, and a montage of the upcoming first/third party games coming to Vita.
For PS4....I really don't know :l. I guess they could show off more of the Order, DriveClube and Uncharted with a PROPER release date (serisoully, no more delays on next-gen games man), have Sony Bend/Grullia Camberage/BluePoint/Insomniac show off some new IP, properly announce Beast Souls and have demos of some third party games (Desteny, Mad Max, Far Cry 4, Batman Arkam Knight, some unannounced one). I also hope for a 1TB PS4 to be announced too alongside a Vita+PS4 bundle at 450$, but who knows if that will happen :l.