Metroid Prime 3 contains an update. If the game is from your own region, you can safely install it.
The NTSC version was released first and PAL later. So unpatient PAL users also wanted to play the game. But as you may know, running an update from a region that is not your own may brick your Wii. So they discovered a little trick. They let the update run, but cancelled it (by shutting down the Wii) when the update was at about 15% or so. That was enough to make the game run, but it wouldn't brick the Wii. But I believe it did result in duplicate news&weather channels.