60 FPS over everything! Splatoon had big problems when multiple player were throwing bombs etc. . Splatoon 2 shouldn't have this.
Also MK8D and Splatoon can not really be compared as MK8 mechanics allow for much higher online latency whereas Splatoon is more like a fighting game.
One of the biggest problems could be the calculation of the ink drops. Those are really fascinating and I can imagine that moving up the resolution wouldn't scale that well in terms of time needed....







