JoeTheBro on 16 March 2013
At first I'd think 2D because the DS had 3D Metroid as an early game. Nintendo would want to spice it up. However the 3DS is 3D so a traditional 2D game wouldn't fit the platform as good as a 2.5D game kinda like Other M. However Other M didn't get the best reviews so Nintendo would probably stay clear of that format. Therefore my answer is: third person 2D shooter similar to Killzone Liberation.
