The exact same issue that happened to Japanese gamers that bought Brawl is now happening with Mario Kart Wii. Some people that purchased the game are complaining that their Wii cannot read the disc, and the game is freezing/crashing. Nintendo has once again stated that the problem is due to Mario Kart Wii being a double-layer disc. Nintendo will clean your Wii for you, which should do away with the problem. I would be very interested to find out if the people experiencing the Mario Kart Wii problem also purchased Brawl.
PSA: This might be a good time to remind everyone that you can filter stories here on the site, especially if you are hoping to avoid spoilers of a Hyrulian nature. This is available only to registered members.
Edit Profile > Custom Filters > Games Type "breath" or other keyword to find a game, and make sure it says "Exclude".
Bam. Media blackout on that until you tell us otherwise.