CD Projekt Red revealed during its Summer Conference that The Witcher 2: Assassins of Kings has now sold 1.7M units across PC and Xbox 360. The Xbox 360 version was released on the 17th April.
However, there are more versions of The Witcher 2 coming, as the game will be hitting Japan on the 360 on the 23rd August, while a Mac OS version is coming this Fall 2012.