Nintendo is offering a free game promotion again.
Register a 2DS, 3DS, or 3DS XL and a copy of SSB, Pokemon Ruby/Sapphire and pick a free game:
Monster Hunter 3, LOZ:LBW, Yoshi's New Island, Kirby Triple Deluxe, Mario Golf World Tour, Mario Party: Island Tour, Pokemon Art academy.
Those three games don't come out for a bit, so hang on to your console Serials!
Source: various websites just starting to post this gamespot, videogamers etc.
Edit: Sorry guys apparently it's only been confirmed for Europe so far, let's hope it'll be announced for NOA as well soon. I'll update as soon as I hear/see more news.