GOG PR manager Lukasz Kukawski told VG247 that Gop had apparently left not only CD Projekt Red, but the game industry in general, though no information was provided about his future plans.
Update: CD Projekt confirmed Gop's departure in a statement to Joystiq, also including a note from Gop saying that his reasons for leaving were "mainly personal." And as for leaving the game industry, Gop said "though possible, I wouldn't bet on it. It's addictive..."
Also, Lukasz Kukawski is the PR manager for Good Old Games, not CDP. We've corrected that reference.