Says the developer:
Our goal is to make our fans and customers happy and to reward them for buying our game and DRM schemes does not support our philosophy as they might create obstacles for users of legally bought copies.
Our approach to countering piracy is to incorporate superior value in the legal version. This means it has to be superior in every respect: less troublesome to use and install, with full support, and with access to additional content and services. So, we felt keeping the DRM would mainly hurt our legitimate users.
This is completely in line with what we said before the release of The Witcher 2. We felt DRM was necessary to prevent the game being pirated and leaked before release. This purpose has been served, so we are pleased to let our users enjoy the full freedom of game usage they deserve.
Outside of the removal of the DRM, the update will also bring a free DLC quest, frame rate increases and greater stability.