Remember this? The console we used to call Durango was covered in black-and-white stripes? We couldn't show the pre-release machine to you then. But now you can see it, as featured on GameTrailers' Xbox One behind-the-scenes special and spotted on Twitter by @Talaviir. Maybe it was for security, maybe it was just to look cool. They do this for cars that aren't officially out, too.
The final console, however, is black. "Liquid black" to be specific. The blackest black possible, a Microsoft designer noted to me today.