To be honest I really will be irked if the game doesn't contain a ton of real world conspiracy theories, that's one thing that really drew me into the first game, they treated their source material very respectfully, regardless of how over the top some of it is.
The trailers already talk about "corporations have more power than the government." Which, true or not, is the most discussed real world conspiracy there is.
I'd be content if they stuck with just that, without tossing Freemasons into it or going back to Illuminati. Yeah, the Illuminati will surely be in the game somewhere, just because it's part of the setting, but I'm kind of hoping they don't focus on the fact that the corporations in power are the Illuminati.