According to G4's schedule
Monday, June 4th
12:30 PM MICROSOFT Press Conference (online only)
3:00 PM E3 2012 LIVE
The first day of our E3 2012 LIVE COVERAGE starts with a a TWO-PART HANDS-ON DEMO you won't want to miss. We’ll also be playing through HANDS-ON DEMOS of Dishonored, Halo 4, Defiance, and Borderlands 2.
4:00 PM ELECTRONIC ARTS Press Conference (online only)
5:30 PM UBISOFT Pre-Show
6:00 PM EVENT: UBISOFT Press Conference
7:00 PM UBISOFT Post-Show
8:00 PM SONY Pre-Show
9:00 PM EVENT: SONY Press Conference
10:30 PM SONY Post-Show
Tuesday, June 5th
12:00 PM NINTENDO Press Conference (online only)
4:00 PM E3 2012 LIVE
The first day of the convention begins with LIVE COVERAGE followed by a HANDS-ON DEMO with Sony's upcoming God of War: Ascension. We’ll also be playing through HANDS-ON DEMOS of Assassin’s Creed 3, Tomb Raider, Resident Evil 6, and the latest Medal of Honor game. We'll also be featuring the WORLD PREMIERE of Skyrim Dawnguard DLC with special guest Todd Howard.
As for my expectations... I'm hoping to see some reveals of new games they're working on. I want to see that we're not just going to get a lot more info about stuff we already know about. I mean really, E3 is about showing us new things, not things we've already known about. Though I know my expectations probably won't be met again this year.
Realistically we're probably going to see more on Halo 4, PS All-stars Battle Royale, etc...