I think it's because of the limitations of the 3DS hardware. They'd have to scale back some portions of the game for the 3DS version (Sakurai said something along those lines in an interview).
Ironically, this makes me more likely to buy both versions so it's probably a good thing from a sales perspective. Really looking forward to the next Smash. I dig that it looks closer to Melee than Brawl (which was too slow for me). Looks like they're listening to fan demands as well. Great!







