In the third Deus Ex: Human Revolution "Behind 2027" video, the developers at Eidos Montreal step into actual gameplay. The previous two were more focused on the game's setting and all the work that went into designing this vision of our future.
Today, the topic centers around one of the most important gameplay elements in Deus Ex: stealth. Stealth forms one of the game's four pillars of gameplay, the rest being combat, social, and hacking. In the video, we see how a sneaky approach can benefit Adam and help him get around with minimal direct confrontation.