According to a Microsoft spokesperson, the Xbox One’s new controller will be compatible with PC but that this feature will most likely not be available until 2014 due to changes in the new wireless and wired modes of the controller as well as integrating them with pre-existing PC games which currently support the Xbox 360 controller.
In addition to these recent reveals, Major Nelson also could not confirm whether cross-platform party chat from the Xbox 360 to the Xbox One was possible in a recent reddit post, saying that it may not be possible due to the changes Microsoft has implemented with an increase in the newer bandwidth CODEC for its improvements in audio quality.