One impressive touch is the flashbangs. These produce a blinding light and loud noise, to distract the enemy and give you a few seconds of freedom. If you happen to be too close to one, though, you are in trouble. Plus, weapons all have small touches now. The Frag Grenades work a bit better and damage the walls, and your team, if you are not clear.
Fragments can even fall from the sky if it explodes up there.
The first mission has you in a torn up Kosovo, early evening, in the rain. You have to rescue some UN hostages from a group of terrorists that will not hesitate to shoot you or the hostages. The lighting is drab, the rain makes for a grey tone to the air, and your team moves with stealth and care and fluidity. Shadows play across their outfits and little puffs of breath waft up as they go. All of this makes for an eerie and gloomy atmosphere which is just what you need.