According to the official product information, the wireless controller features a premium button design, while the the d-pad transforms from a plus shape to a disc.
The Xbox 360 Silver Wireless Controller also comes complete with a Play and Charge kit to save on batteries. The controller isn't due for release until March in the U.K, but a quick scout about online reveals that you can already pick it up from various online retailers for anywhere between £40-£60.
Check out the release video.