Apple apparently has a Wiimote-like remote in the works for their Apple TV. At least, that's our best guess regarding this patent from November of 2006, as we can't imagine what else Apple would have this planned for. Apple's version of the Wiimote even has an accelerometer, as well as a rather specific purpose detailed that relates to gaming.
Of course, it's only just a patent. We've no idea about the possibility of this device actually becoming a product on retail shelves.