SourceAnother Wii System Update is available. There's no letter from Nintendo in the Wii inbox explaining what it is for and no noticeable changes on the surface. The Wii System version still says version "3.2U," but there is something new to download.
Go to "Wii Options" in the lower left of the Wii menu, select "Wii Settings" and then choose "Wii System Update" to download it. A fairly recent Wii system update was available on 3/20/08, which was in preparation for the WiiWare releases.
Maybe it was something else to prepare for WiiWare? Or maybe its like that one time with the weird ? mark showing up in peoples saved data.
I will have to check my Wii later on.