I heard about this before I bought the game. Even before I bought it we had a long discussion on it at the game store I frequent. Only one guy did not yet know about the bug, out of the ten people there (the 4 who did not even play the game still knew about the bug). They have a game room downstairs, we sit around playing board games and video games. It is glorious. When I bought the game, the sales guy warned me about it also.
Nintendo does have a good track record of customer service, I have never been disappointed by them. So I am not the least bit surprised that they are getting a patch out quickly.