Well, none atm. However, I do plan on playing them. Hopefully my comp can handle them. Is there an official website on the lore and background on the character and the world?
Expect a very different game from Skyrim. The core of the Witcher franchise is story and C&C, rather than a huge map or a large quantity of quests. As others have said, there is bound to be many sets of armor and other customizations. I'm expecting to see custom hairstyles again, even if they do it as a DLC, which is what they did in TW2.