A friend of mine gave me a code.
My preview so far of the demo:
-5 characters (Mario, Link, Pikachu, Megaman and Villager)
-The game plays veeery nice, even with the small screen (regular 3ds)
-Megaman is slow as hell, but fun to play
-The game looks a lot better than the screenshots, really.
-Seems less floaty than Brawl
Will update more later, only played a couple of fights
3DS FC : 4339 - 3326 - 7693. Add me :) Nickname Tin