Check out the Promo.

It looks like they will all be shown, Halo 4 will be starting off the Microsoft press briefing with a 10 minute Campaign showing, this will be Monday July 4th at 9:30 am PST 12:30pm EST

I for one am very mush so looking forward to this, I think this is going to be a crazy E3.

I really hope that Halo 4 turns out to be more than just the same thing.

Great! Interested to see how 343 change up Bungie's formulas.

June 4th. 'Most epic campaign in any Halo game yet'--343 dude. Hmmm well we'll just have to see about that. Guardedly optimistic, and I will not look at any of that campaign. No really I swear....must resist.

I hate all this lead up to E3, there are barely any surprises anymore.

@pweidman: But it's gonna be sick yo!

Full blown campaign demo eh. So pumped!

It's gonna be Halo, I'll bet you guys tons of Brad Bucks. All the multiplayer they've shown is very similar to the past games.

What will be interesting is that I remember hearing Master chief isn't going to be the only spartan in campaign and that he will have to deal with becoming obsolete.

@Zacagawea: He will most likely still be superior to the Spartan 4's.