I'm with you on this. If I would have read that tweet 2 years ago from a Bungie employee, I would've shit my pants. But with the info we have on the MP, I really can't get myself excited. Campaign info could be okay but I don't want to be spoiled on that front.
The only thing that could really excite me is the announcement of a ranked (doesn't have to be Halo 3 ranked) without all the added bullshit. Everybody has the same starting weapon (BR, DMR whatever as long as it's a precision weapon), there are no perks, no armor abilities and no bullshit ''semi''-random weapon drops. Just weapon spawning, power and normal weapons, like in the previous Halos.
That would make me really happy.