I get the impression that Kojima really wants us to slow down and think about what we are doing. In previous games, it was easy to simply figure out the patrol routes of guards, then time your movement to take advantage of the situation. I am reminded of the Tanker Chapter in "Sons of Liberty" when you could run down a corridor when a guard's back was turned, slip into a locker before he turned back, then wait until he walks away to get by. Granted, it was a tutorial mission, but as a general rule, there was only one entrance and one exit to the area. I don't mind the occasional bottle-neck, but I also like the ability to think laterally - like when you break into the Granin Design Bureau in "Snake Eater".
This time, I imagine that Kojima will want us to be aware of how we fit into the game world, and how our actions might have consequences ten, thirty or sixty minutes from now.