The REDkit, a powerful content editor designed to let The Witcher 2 players create their own adventures quickly and easily, will release publicly in "the first half of 2013." However, the completely free tool has been rolled out to beta testers picked from 600 modding teams, which should hopefully allow CD Projekt to tweak any problems and secure a large amount of user-generated content at launch.
REDkit allows any player to create a "living world" with the use of advanced landscape design tools, 24-hour day-and-night-cycle simulations and thousands of ready-made assets used in The Witcher 2. It also makes it possible to modify the original game, which is already vast in scope. If you want to know more, the walkthrough video above demonstrates how quickly and effectively users can design an entire quest.