I think its safe to say they'll drop some gameplay footage of Halo 3 ODST, but do you think they're going to reveal their next big project? And what do you think it will be?

Personally I would like to see a new Marathon tied into the Halo universe or some crazy shit like that.

There will be a timer and then an announcement saying they cancelled the anncouncement

No. ODST is the project.

ODST will be the only thing they'll show at E3. No real surprises in store for us from them.

Yeah, pretty much ODST is going to blown the hell out and then sometime early next year is when they're start teasing us with what they're doing next.

They need to make peace with Microsoft (or Microsoft needs to make peace with them; bottom line, they need to kiss and make up). Talking about what's coming down the line would only clutter the message of "ODST IS GONNA BE FUCKING SWEET GUYS!" And that isn't in the interest of anyone involved.

Hopefully just some ODST footage.

I'd bet just ODST footage.  They haven't even shown a screenshot of that, so they won't be revealing any second project right now.

halo reach! new they were ganna reveal something else BOOYAA!