Yes, he does. I also thought up a few things in a another forum recently and decided to post it. Here's some of them:
Here are some of mine:
• Throughout Missions wherever you have to sneak, you have to gently move the analog stick to stalk.
• Whenever you're sneaking about, you have to make sure that there's no junk in the way, so none of the enemies can here you.
• With stealth being implemented in the game, I think that if it's going to be a night job, Shadows and dark area's could be used for hiding.
• Whenever you get caught in the mission, guards would attack you and try to kill you. So If you run away, and hide in a place where none of the guards can see you, they would be more careful and check the area when they feel like it so it would make it more harder for the player.
• Whenever you're behind a enemy, you should be able to interrogate with the enemy. Whether you're looking for something or trying to take cover, a guard would be a possible back up for you.
• If you interrogate with them, they should give you types of hints.
• If you leave a dead or knocked out body, the guard will run for help and get another guard to search the area with him.
I know that all of this has been already implemented on another game, but I'd like to see most of this in IV.