New juicy details from German magazines Pc Games and Gamestar:
~ 50 hours average playthrough
~ Savegames will dictate which character from the previous games returns
~ Hunt animals for fur and track their colour-coded markings in the wild
~ Npc's alert the guards if they see you stealing
~ World’s economy is dynamic and is affected by what you sell, and how much (Oh...my...)
~ Geralt can even jump now – praise gravity!
~ Geralt has a new combat mechanic that lets him target body parts, which is a bit like VATS in Fallout 3
http://www.vg247.com/2013/02/28/witcher-3-is-50-hours-long-new-previews-offer-fresh-details/