Well, uh... I don't really know what you're exactly getting at, but I know that Pikachu is confirmed, as is the PokÈmon trainer, who can call out wither Charizard, Ivysaur, or Squirtle out of a PokÈball. I don't know exactly how it works, but I hear that it's a hoot!
From what the SSBB Dojo is saying, you rotate between the trainers 3 pokemon but they all share the same damage meter. Also, something about a stamina effect whereby if you overuse one pokemon, it can tire and it's attacks become weaker/ineffective...or something close to that. Therefore, it encourages you to use all of the pokemon evenly rather than leading with one all the time.
I liked the concept of how Zero Suit Samus emerges. Apparently, by using these new "Smash Balls" to unleash your characters ultimate attack, Samus's one overloads her suit and it falls off her...thus leaving you with "Zero Suit Samus". Not sure exactly if she'll be a selectable character from the start (as in on the character select screen). Maybe they might do the thing they did for Zelda/Shiek. If you hold the A button before the match starts with Zelda, you can sub-in as Shiek instantly rather than transforming from one to the other.
Snake's the one I'm most curious about. Someone I wouldn't have thought to star in such a particularly-styled game to make such an appearance is great! I can imagine the people's shock at the E3 presentation when they saw that clip of him jumping out of the cardboard box.

Looks like they are staying very true to his movements. The P-P-K combo, rolling into crawl postion, using the stinger...can't wait!
Bet all American gamers who are into this are ecstatic about the given release date! Early Dec I've read (Lucky sods

) Just in time for Xmas. Guess we've gotta sit and wait til about Jan or early '08!