RPGVault's Jonric has <a target=_blank href=http://rpgvault.ign.com/articles/520/520848p1.html>interviewed[/url] two <a target=_blank href=http://www.thewitcher.com>Witcher[/url] dev team members - Michal Kicinski and Ryszard Chojnowski. Here's a snippet:

• The game is divided into five chapters. In each one, the player will have many different quests to complete. We try to keep the structure of the game as open as possible, meaning that most of the tasks can be accomplished in many different ways. You'll be also able to attack and kill practically all the characters you meet, even your friends - if you are skillful enough. Depending on the player's decisions, there are also three different endings. Which one occurs is affected by the players' actions throughout the whole adventure.

No invulnerable NPCs is always a good thing. Too bad quite a big portion of this interview is copy+pasted from the game's official site...

Cheers, DemonKing!