Man, where to begin

!
PS3/PS4/Vita:
TONS of great indie games on stage (Witness, Oddworld Abe's Odyssey HD, and tons more being shown off
New bundles for each platform (a 200$ PS3 with no hard drive but having a 1TB Hard Drive with a year of PS+, PS4 getting a bundle with Vita 2000 for 500$, Vita 2000's many other colors coming state side in themed bundles with games ala God of War Collection + PSP games with Red Vita, ect)
Three New Cross Buy games announced: Sly 5, Ratchet and Clank Movie Tie-In, and CRASH BANDICOOT Remastered all between this fall (Crash and Sly) to Early Spring Next Year (Ratchet)
PS4:
Last Gardan (this has to be here...its been
way to long at this point :l)
Demo of the Order + Fall Release date
New Trailer for Uncharted 4 with a fall 2015 release date
New Trailer for DriveClub + Demo (with this demo being put on PSN during E3, considering the games long delays

) with a late summer release date
On Stage Demo of FFXV with more info on the game (Square isn't stupid enough to give a release date...they will delay the game for five more years at this pace XD)
Montage of all the Indie games that have landed on PS4 with showing off more to come
Showing off new IP from MM, Guriall Games, Sumo Digital, and Sony Japan
Showing off Beast Souls (that 'leaked' game) and a surprise 3rd party exclusive
Close the show with a Demo of KH's 3 with Sora using a light-saber fighting stormtroopers (common, a SW's world is a given at this point

) alongside a montage of some of the worlds that will appear in the game (hopefully Frozen, Tangled, Jungle Book, Huntchback, and Fantasia 2000)
PS Vita:
Show off currently announced games
Show off demo + trailer for Gravity Rush 2 with a fall release date
On-Stage demos of SSD, Over My Dead Body 2, and Freedom Wars with a NA/EU release date
Announce more ports of Collections (Ico Collection, Ratchet Collection) + ports of PS3 games (Ratchet Nexus, MotorStrom, Demons Souls, ect)
A new IP from MM or a sequel to Tearaway
Sequel to Killzone Mercenary coming this fall (or an expansion pack of sorts)
Price Drop for Memory Cards + 64GB Card coming stateside for 60 bucks
Announce from E3 onward that all PS1 and PSP content on PSN WORKS on Vita
That sounds realistic, well to me at least

.