Mario Kart for the 3DS will launch this holiday season. The game will include all terrain karts that transform on ground, air or sea. Also there will be a mode where you can customize your kart.
Star Fox also announced for the 3DS. It will include a multilayer mode where it'll record your salty face when you get killed by some one. The game will be available this September.
A new Super Mario game was announced for the 3DS too. Not much info on this one, only that the Tunaki Costume is back... yay?
Kid Icarus Uprising will include a three on three player combat mode. There will also be a card playing game using the 3DS's camera which looks really dumb. The game was announced to be released later this year.
A new Luigi's Mansion game was shown on the conference today. The game will take place in several mansions, instead of just one like in the first game.
Other 3rd party titles for 3DS included Resident Evil Mercenaries, Mario and Sonic at the London 2012 Olympic Games, Ace Combat 3D, Tetris, Cave Story 3D, Resident Evil Revelations, Driver Renegade, Pacman & Galaga Dimensions, Tekken 3D and Metal Gear Solid Snake Eater 3D