The demo we saw was actually shown to us three different times -- it's the same exact scenario, just played through with entirely different approaches. Here's the setup: about 90 minutes into the game, you're given the task of infiltrating the morgue at a police headquarters to retrieve a chip embedded in a dead terrorist's head. This terrorist is part of a group against transhumanism (people augmented with cybernetics, which is the product Sarif Industries, your in-game employer). But here's the catch: the terrorist himself has cybernetic implants. So he must be some sort of plant within the terrorist organization -- but a plant by who? The government? You're on a mission to find out, which is why it's imperative you get access to the morgue and get that chip.