Around 3 AM (yes silly, this night!), every 3DS owner got a new System Update.
Many users in America, Australia, and Japan have noticed this, when accessing the Nintendo eShop.
However, there’s nothing known about this Update at all, although Wikipedia refers to the ability to get into the System Settings, without the need for a Parental Control Pin.
The Mario Kart 7 Glitch is still not patched.
We absolutely don’t know what Nintendo wants to give us, though.

Update
Read this article, for more about this Update:
http://www.yamihoshi.nl/tech/3ds-mario-kart-7-patch-is-now-in-the-eshop/