There's a preview up for The Witcher 2 over on Destructiod, along with some screens from the prison break portion of the game along with a boss fight.
According to the preview, quests are less fetchy and "more fun" this time out, and you will be able to "import your save games".
The game will also be playable on mid-range specs at release, which are considered high-end at the moment, and the post implies The Witcher 2 may give you a good enough incentive to upgrade your PC.
Good enough for us, then.
The Witcher 2 is slated for PC in early 2011 with consoles still to be determined.