The 3DS has just received an update to it’s firmware. No word on what it does right now, but you can download it in the system settings menu. I’ll update this post when we find out what it does. Because we got no announcement before hand, the update probably does more behind the scenes things such as security fixes, but there is a chance that something significant will come out of it.
Update: The only new feature a Wikipedia article points out is “System Update (In System Settings) can now be entered without a Parental Control Pin”. It is possible that some smaller new features will be discovered, but it seems to be a small update.