The limit of "Four characters per franchise" wasn't a bad idea in Brawl, IMO, so if we could work within those constraints...Well with kid icarus finally complete Sakurai can get tl work on SSB 3ds/WiiU(which will probably come out in 2013)
Which brings me to my question. What would you like to see in the next SSB. I'd like to see a few guest characters notably megaman. Sonic and Snake were a huge hit. Bring some more new additions of even characters that were relatively unknown to certain people like Pit. DLC, and Version Exclusives wouldn't hurt. They'd definitely make more money by it
Pokemon would be a tough one. Personally, I dislike Jigglypuff and would like to see her removed from the roster. But is anything from Gen-5 popular enough to be used as a main character here? Lucario would probably be the most likely victim of the axe, but it makes so much sense for him to be there (Fighting Pokemon. Fighting game.) that I'd HATE to see him go. The only acceptable substitutes would be Blaziken (who was probably going to be in Lucario's place if Diamond and Pearl hadn't come out yet) or Keldeo (Fighting-type from 5th Gen and current promotional figure). I wouldn't put it past them to replace Red (with Squirtle, Ivysaur, and Charizard) with a 5th-Gen version with Oshawott, Servine, and Emboar.
Maybe Ridley will be a playable character in this new game instead of a boss. I mean, isn't Bowser typically like four times bigger than Mario? But he's playable.
From Fire Emblem, I'd kind of like to see someone else besides a swordsman. Maybe Hector from Blazing Sword. Or a mage-like character (I'm not as well-versed in Fire Emblem as I'd like to be, so no mages seem important enough off the bat. Feel free to help me out here.).
After the supposed success of Uprising, I'd like to think Palutena might be a possibility for a playable character (most likely a secret character). Pit would cover the bow, while Palutena might be better off with a blade or a staff, or claws like in the Revolting Dinner cartoon. ( :D )
And if they attempt another Subspace Emissary-style adventure mode, I'd like to see a much greater focus on villains pooling their resources together to create a massive monstrous army. It's kind of disappointing when the enemies are limited to Mario enemies and Subspace creatures. What about Koopa Troopas working alongside Octoroks, Space Pirates (the Metroid kind), Sir Kibbles, Koffings, and the Tikis from DKC Returns? With Twinbellows leading the charge at the end of the level? (Not enough bossses in Subspace, btw.) On the other hand, let's also drop the Great Maze level at the end, okay? That was painful.