The Super Smash Bros for 3DS demo is supposed to come out Sept 19. I received some download codes for early access to the demo from Club Nintendo. Feel free to use them if you want to check out the game early. First come first served.
New Smash Bros is ridiculously good. Much faster than the sluggish Wii version, more fluid than Melee. Mega Man is really strange though, takes some getting used to.