There's been some quotes taken out of context that I wanted to clear up before they get too out of hand. What we showed you on September 1st was, for the most part (99.9%), everything you'll have in the box. When I said "We haven't shown everything yet" - the full quote was "We haven't shown everything yet; there are things that we didn't put in the presentation, but are there for you to find: like Host Migration, Prestige Leaderboards, In-Game Friends List, etc."
When editors write articles, they'll cut quotes down to keep their paragraphs concise, which isn't necessarily a bad thing, but communities sometimes overreact heh. We also didn't put everything in the presentation we showed, because that would have been way too much information for consumption in one sitting.
So everything was there... We're just not going to release our Game Design Doc in written format. Rest assured, there will be things you'll be uncovering once you get the game you didn't hear about. The really important things (core gameplay, new game modes, fundamental changes) have been communicated, though.
But we only showed 4 maps a the MP Event, we only leveled the accounts to Rank 25 (so not all weapons were unlocked), and not many people unlocked any Pro Perks at the event - so that's what I was referring to with my quote. There is plenty still yet to be uncovered. That's the point of ranking up, to view the "Classified" components to MP .
Hope that helps.