Excellent preview up at CVG: http://www.computerandvideogames.com/article.php?id=238512
...There's a real community here. People squeeze past, hang washing on lines. You'll see a woman chopping and cooking and a man talking with his son. Further along there's a bar, a dining hall, a group sitting around a fire, one of them playing a guitar. You can listen in on all of their conversations, and although they sometimes all bleed into one, with distance and volume not always proportionate, it means the whole place feels alive. There are remnants of Half-Life 2 here and the atmosphere has a Fallout feel, except it's tight and cluttered, and the people feel organic whereas Fallout was sprawling and somewhat static.
Take for example your first venture into the outside world. Moscow is literally a bombsite with broken roads and buildings beyond derelict. You have to negotiate the terrain to find a path to where you need to be and every now and then you'll hear a screech from a mutant somewhere in the distance. You'll instinctively spring to action, take aim and scan your surroundings. Scarier still is when you see a mutant in the distance, or even worse, when you turn a corner in one of the bombed out buildings and almost bump into the back of one. What's special though is that if you're lucky you can get out of there before the mutant turns around to see you. Until then, you can almost observe them and it feels like they'd still be living, breathing and savaging whether you were there or not.