However, it's now been discovered by Kotaku that the footage of the game shown in the video is from the PC edition, not the Xbox One version, despite the Xbox logo being featured prominently. Microsoft has since apologized for the confusion (more on that later).
Microsoft never explicitly stated that the footage was not captured on Xbox One, but--just a few hours after the video went up--the company added a disclaimer to the video to say the footage was "captured on a PC."
One major giveaway that the footage was captured on PC and not Xbox One is that the gameplay video plays at 1080p/60fps. The Xbox One version of The Witcher 3, however, outputs at 900p/30fps, which raised some red flags--the video's comments are overflowing with people pointing out the difference.
In a statement sent to GameSpot this afternoon, a Microsoft representative said it never intended to misrepresent the visual fidelity of the Xbox One version of The Witcher 3, and apologized for any confusion caused by the video.
“This morning we posted a new trailer for The Witcher 3: Wild Hunt to our YouTube channels featuring footage provided by CD Projekt Red that was captured from the PC version of the game and may not be reflective of final Xbox One gameplay," the spokesperson said. "This was in no way intended to misrepresent the title on Xbox One. We have updated the description of the asset to make clear the source and platform of this footage. We apologize for any confusion and look forward to the game arriving on both Xbox One and PC on May 19, 2015."
Whatever the case, The Witcher 3 looks quite nice across all platforms: PC, Xbox One, and PlayStation 4. But the PC version, like so many other games, is likely to look the best, as it will run at 60fps (if your computer can run it).