@JoeBlack: H&S is built on the same engine, but it includes much more roleplaying. Take a look at the preview at Gamer's Hell: http://www.gamershell.com/articles/954.html

Here's a quote:

To further add to the RPG elements in Hammer and Sickle, the hero’s daily actions and mannerisms will always affect something in the future. For instance, in one of the earlier missions I encountered a young boy and his mother. If I chose to help the young boy stop a train carrying explosives, he could have helped my weapon situation while his mother could have helped forge documents. However, after a heated argument with the boy that escalated very quickly, I had no choice but to kill him and his mother. With every action there are sure to be consequences, and killing that boy and his mother had its fair share of repercussions. The main hero has a behavior meter, and if he acts extremely out of hand, NATO authorities will interfere and a hell of a mess will ensue. If the forger was still living, she would be able to supply me with a new ID so the authorities wouldn’t be watching my every move. Hundreds of incidents like these will occur, so it’s best to be on the lookout for allies instead of rivals. Throughout the entire campaign, an assortment of these RPG elements help make Hammer and Sickle as enjoyable as Silent Storm.

@Paranoid: Sadly I haven't heard much about Night Watch's release in Europe and the US. What I did hear however was that it wasn't too well received in Russia, and thus it's hard to tell if it will be released outside Nival's country of origin. There it had a very popular movie to help it sell, and that's not the case in Europe or the US.