The glow you see today leads down a dark and twisty path to an update that breaks the Zelda hack. Yes, it adds some trivial features but basically it looks like Nintendo is shutting down this particular back door.
Apparently if you have the Homebrew Channel already installed, it’ll still work. Haven’t tested this though. If you’re interested in this Wii Homebrew Scene, I suggest you get the Homebrew Channel up and running before applying this update. Either that, or just skip the update, though you know sooner or later some game will require it.