Move along, nothing to see here.
If your Wii is glowing tonight, it's because Nintendo has released Wii Menu version 3.2.
Compared to the last Wii Menu revision (which updated the Check Mii Out Channel), this update apparently doesn't do much at all beyond upgrading your Wii to version 3.2U. According to Nintendo's website, it only makes back-end tweaks to "improve system performance". The Wii console's update message claims that the Disc Channel will now be able to display a scrolling message notifying you of a required update if a game needs to install one.
Hopefully this minor update is a sign of bigger things to come!