Predictions:
Sony:
ALOT of PSVita Game announcements/being shown (Cod, Bioshock, Assassins Creed etc)
MAYBE a Super Slim PS3 with a small price cut
Last of us Gameplay
LittleBigPlanet Karting gameplay (YAY)
God of War 4 (MAYBE, unless they are saving it for PS4)
a big secret game for end of year launch
No PS4 announcement.
M$'s
Halo 4 gameplay
New Xbox with Kinect 2. (hardcore will be disappointed in the graphical leap)
Nintendo:
Shit load of 3DS games and a lot of boasting on how well its doing
WiiU games
WiiU release date
thats it really? maybe Apple might show up?
appart from the new xbox i dont see much other massive news worthy news