My prediction for E3:
Exclusives:
Alan Wake 2
LionHead MMO
Black Tusk Shooter Teaser
Ryse
New Epic Game
Forza 5/PGR
New AAA Rare Game
343 Teaser ???
Timed Exclusives
Destiny
Third Party First Peak:
Next Gen COD
Next Gen Madden
At least 4x more next gen games.
Also would no surprise me if Microsoft gets something exclusive from Dead Rising 3.