The image linked in the forum below is, according to the increasingly desperate online Nintendo fan community, a scan from the upcoming issue of Nintendo Power, NOA's official magazine. As you can see, the image shows a female player with a black WiiMote featuring an never-before seen purple 'something' on the left hand side.
Various watchers have pointed out that it does bear something of a resemblance to the GameCube controller's Z button... And that's about it thus far.
Nintendo is slated to make some sort of final showing of the Wii, basically lifting it's entire skirtage for all to see at some point in September, during which time the final ominous Big Secret will be revealed. Stick with us for full details and read this for what appears to be some genuine Wii info taken from recently-release developer documentation.