Update: The Witcher 3 confirmed for Xbox One with SmartGlass integration, Kinect voice commands

[VGKing]

Are these devs notoriously anti-DRM?

Here's an article of them saying how DRM is the worst thing in the games industry http://www.gamepolitics.com/2013/04/26/witcher-3-developer-drm-worst-thing-games-industry

I don't expect them to completely drop Xbox One support, but I do expect them to take Sony's side.