No, Nintendo has not announced that there will be another Smash Bros. - in fact, they've come closest to announcing the opposite.
However, it's still fun to think of characters that should be in the next Smash Bros.. The rules here are fairly simple: the character must have appeared on a Nintendo console as a major character. That's it: the character need not be a Nintendo character, and in fact, by now, probably shouldn't be since Nintendo has kind of hit the bottom of the barrel when it comes to new characters.
First the annoying: it's practically a stylus-only game, which makes it an RSI game. The practically qualifier is there because a couple of actions can be triggered with buttons, but they're intended to be triggered with the stylus. You move with the stylus, you make actions with the stylus, and you make a simple wrist splint with the stylus and some duck tape after playing for a while.
There's some debate over whether or not Final Fantasy VI is the best Final Fantasy ever created. Final Fantasy VI Advance does not disappoint. It's practically the same game previously released as Final Fantasy III in the United States, but with a more accurate translation. It's just as good as it ever was. If anything, this version is even better than the original.
Final Fantasy VI uses a slightly improved version of the Active Time Battle system previous Final Fantasy Advance titles use. Each character gets a single special ability from their inherent class. As in FFIV, a character's class cannot be changed.