Ich habe eben mal einige Trailer zusammengekratzt:

Metal Gear Rising Revengeance E3 2012: Press Conference Walkthrough (Stream)
Need for Speed™ Most Wanted Announce Trailer -- Official E3 2012
Need for Speed: Most Wanted Gameplay (E3 2012)
Watch Dogs | E3 Introduction Trailer [North America]
Watch Dogs - Game Demo Video [UK]
AC3 - E3 Official Trailer [UK]
Assassin's Creed III E3 Frontier Gameplay Demo [UK]
Rayman Legends gameplay [Wii U] [E3 2012]
Far Cry 3: Step into Insanity Trailer - E3 2012
Far Cry 3 Gameplay (E3 2012)
Splinter Cell: Blacklist (E3 2012)
ZombiU Trailer E3 2012
Dead Space 3 Trailer: E3 2012
Dead Space 3 Co-Op Gameplay (E3 2012)
Crysis 3 Trailer
LittleBigPlanet Karting: E3 2012 Trailer
Dishonored E3 Gameplay Demo

Und auf die schnelle auch ein paar Meldungen:

Hideo Kojima Spotted at Sony’s E3 Presser,Konami posts some interesting tweets(MGS5?)
THQ fires THQ San Diego, buries news during E3
Quantic Dream's "Beyond" featuring Ellen Page and Screen leaks