An article from the upcoming issue of Game Informer has been leaked and reveals several secrets yet to be announced by Nintendo.
It seems that the Wii will feature a build in camera for snapshots so you can put your face on character models in the game. The ATi graphics chip is said to be quite powerful supporting HDR and bump mapping.
The Wii will also feature a hardware physics processor, with built in 32 Mb of dedicated RAM, enough to take the load of the IBM CPU. A headset will be available either included in the package or sold separately.
The article also mentions that Nintendo will sell SD memory cards ranging from 2 GB to 7 GB. No price has been mentioned.