This is the part that intrigued me the most
Sakurai said that the first time he saw the 3DS he realized he must make the next Smash Bros as a handheld experience too. Why? Sakurai explained that he’s always wanted to make Smash Bros into a more personal experience, one in which you can level up, gain new skills, and customize your character. But, this would take away from the quick, instant-play feeling of the Smash Bros series. But, with two versions of the game this dream of his can be done properly. Think of the Wii U version of Smash Bros as the public/online/HD-glitz/party game. And think of the 3DS version as a more personal experience. From all the research I’ve been doing, I have come to the conclusion that the 3DS version will be a single-player and co-op game (he said he wants skilled players to be able to assist less skilled players.) It will be a full-fledged fighting/adventure mode that lets you complete levels, beat bosses, and will feature some sort of storyline. The Subspace Emissary mode in Brawl was a very weak, diluted form of this concept and we know from the Kirby series and Kid Icarus: Uprising that Sakurai has the chops to traverse the single-player game territory as good as anyone can. On the 3DS you will be able to learn new skills, gain experience, earn rewards, and customize your character. Your character will be a product of your own blood and sweat, all your hard work. You will then be able to take that character and bring it to the Wii U version to square off in the public arena. Here you will be able to go online, duke it out with friends, check out your stats on the global learboards, and gather the family around the couch for some fun multiplayer battles.