I hope Nintendo plans to add in more content with their future patches, as they did with Conquest in 1.0.2; the game is actually quite light on content, especially in the single player department. Some new Smash Run maps would be nice, or even new features for the one existing map, which gets old really fast. Maybe randomization of the challenges in Classic mode, or All-Star? Enable special brawl modes again, like stamina or 300%? (it baffles me that they were included only in Smash Run for some reason)
A mode to use equipment and custom moves vs strangers online would be nice too. Or even just the ability to play a 4-player fun match without lag making it unplayable. Right now the only other option is to get stomped into the dirt in for glory by nerds who spend every waking minute playing the game and memorizing every cheap combo and frame of animation.