This update is lame. Maybe if it was anything like Apple's recent update..
Where now, if you updated your iTouch or iPhone to 4.0, you get a new App, add wallpaper to the background, and everything overall looks a lot better.
That's an update.
Nintendo is screwing everyone over with their BS update, so once again, don't UPDATE! xD
They always send you a message before you update, read it.
If it says that it's doing "behind the scene" works, most likely, that means they are trying to rid of Homebrew.
Until they make a super awesome update, I'm keeping my 4.2 xD