E3 starts tomorrow, and I'm going to give my thoughts on what is going to be at the 3 press conferences.

Microsoft:
Lots of news about and a demo of Halo 3:ODST
Possibly a release date for Alan Wake.
PC versions of Halo 3 and Gears 2.
Beta for sure will be going on for 1 vs.100, live host will be there?
Next Primetime event, whatever it will be.
MGS4, at this point...yeah.
Zune connectivity to 360
Modern Warfare 2 and Guitar Hero 5 demos? (possibly at sony also.)

Sony:
God of War 3 coming this year.
PSP: GO!, plus PSP MGS, Assassin's Creed, Little Big Planet, and Gran Turismo.
PSP: GO! connectivity to PS3 (more gimicks...)
Uncharted 2 demo.
If MGS isn't announced at Microsoft, it will be here. Maybe the PSP version?
Next PSN firmware update, voice chat stuff, improving fluidity, etc. etc.
Talk on PS2 and how (insert number here) games are coming out on PS2 this year.

Nintendo:
More talk on how they will serve the hardcore gamer...and then nothing will happen.
Next Wii Music type idea.
Demo of a bunch of games that will use Wii Motion Plus.
More actual games that will come out on DSiware.
New Zelda and Mario games, it has been a while.
WiiFit plus...
Not to much out nintendo this year I'm afraid.