CD Projekt RED confirms yesterday's indications that preorders for The Witcher 3: Wild Hunt are underway on GOG.com and Steam, adding that preloads on Origin should begin on Thursday. They tout their own service for this, and outline when to expect this to unlock (less than) one week from today:

Everyone who pre-orders the highly anticipated, next-generation RPG, can choose to preload the game and be one of the very first to play The Witcher 3: Wild Hunt when it goes live on May 19th.

At GOG.com, the simplest way to preload the game is through the recently announced GOG Galaxy client. GOG Galaxy is fully integrated into the DRM-free release of The Witcher 3: Wild Hunt and includes convenient auto-updates, game time tracking and achievements.

The game is also available for preload to gamers who purchased Wild Hunt on Xbox Live, and will be available for PlayStation Network users soon.

The Witcher 3: Wild Hunt will be officially released and unlocked on May 19, at 1:00 AM CET (Warsaw time), i.e:

May 18th, 4.00 pm PT (Los Angeles)
May 18th, 7.00 pm ET (New York)
May 19th, 00.00 am BT (London)
May 19th, 2.00 am UT (Moscow)
May 19th, 8.00 am JT (Tokyo).