No major additions just a bit of background improvements.

3DS firmware version 2.1.0-4E has been released this morning. While there are no new additions to the Home Menu or elsewhere to report, the update simply offers;

"System stability improvements and other adjustments.
Further improvements to overall system stability and other minor adjustments have been made to enhance the user's experience."

Of note however is that if you had left your 3DS in Sleep Mode overnight you should not have to wait for the update to download, it should already be on your system waiting for you to accept/confirm the update. Providing you were already on the previous firmware version.