Xbox One will support up to eight wireless controllers simultaneously, according to the official Xbox One product page.
Comparatively, current-gen Xbox 360's support up to four controllers at the same time. PlayStation 3 supports up to seven controllers, while Sony has yet to confirm how many can be connected to PlayStation 4 systems at the same time.
Xbox One will release with a single controller at launch this November, while additional controllers can be purchased for roughly $59 in stores once released. Microsoft previously confirmed it is working on a way to make Xbox 360 controllers compatible with the new system.
The newly designed controllers are detailed on the Xbox One page, which states the controllers will also have a 30-foot wireless range. You can check out Polygon's hands-on impressions with the controller right here.