Soundwave on 17 May 2013
What did they release for the first few months last year? Kid Icarus Uprising and ...? This year on the 3DS side at least they have Luigi's Mansion, Fire Emblem, Pokemon: Mystery Dungeon, and LEGO City in the first 4 months.
I think Mario & Sonic London Olympics 3DS in the US is techincally published by Sega (that came out in the early months for 3DS last year) so even that doesn't count.
