In case you were wondering if your collection of plastic guitars and controller would work on Xbox One, you've got your answer today. Unlike the whole used game debacle which has seen many conflicting reports, Microsoft has only offered up one response to old controllers and accessories working on Xbox One - they won't.
Here is the official statement parroted off by Microsoft to sites such as Joystiq:
"Xbox One was designed from the ground up with entirely new technology to deliver a new generation of experiences for both games and entertainment For example, the Wireless Controller will connect to the console using high speed data transfer to enable higher fidelity headset audio and future controller add-on experiences that are not possible with Xbox 360 wireless technology. Additionally, the all-new Kinect sensor's ability to locate the wireless controller is dependent on new technology. In order for Xbox One to deliver robust, meaningful gaming scenarios for all users across all experiences, only Xbox One controllers and accessories will work with the new console."
It does make sense that old controllers won't work, considering this is often the case for new console launches. In fact, it was mainly only the PlayStation that had kept their items cross compatible until the PS3 era. So be ready to buy some new controllers for the system. Alongside that, grab a new headset, fight stick, and whatever else you use on the 360.