Just got that 3DS update. It's really great! Once they add friend requests and messaging, it will be perfect. So glad screenshots are supported on 3DS, even 3D screenshots work.
This also allowed me to fix an issue on my Nintendo Network account in general. When a certain Wii U update was made, it automatically restricted Nintendo Network accounts from being accessed on external devices. You had to use Parental Controls to change this, but somebody put a Parental Control PIN on my Wii U without telling me and without even remembering they did. So I would of had to ring Nintendo customer support about it, to get my PIN reset, but because I linked my account with my 3DS, I was able to turn off the restriction as I have no Parental Controls set on it. So now I can post Wii U and 3DS screenshots outside of Miiverse!