Xbox One controller compatibility for Windows PC is nearing public release, according to a reply from Microsoft's Larry Hryb on a NeoGAF thread about the topic.
"Soon. Very soon," Hryb (AKA Mjr. Nelson) said, replying on a NeoGAF thread about when the necessary drivers would be made available via Windows.
Microsoft said back in August of 2013 that Windows support for Xbox One's peripheral would arrive sometime in 2014.