Wow, this new list is different.
I agree that Luigi will get the vacuum cleaner makeover, although as a luigi main I hope he doesn't change too terribly much. At least to his air moves, since now that I think about it the only special move of Luigi's I'd mourn the loss of is his down special.
Still, I agree that there's no way that Mario get's the FLUDD without Luigi getting his vacuum. Also, Mario's FLUDD: A move that pushes people with no damage. Luigi's Vacuum: a move that pulls people with no damage? Makes sense to me.
I also agree that Pokemon has seen the last of it's newcomers in Poke Trainer. Seriously, we've just been handed three new characters (yes, Wiseguy is right and PT counts as three, deal with it), why is there so much speculation over who the fourth will be? How many pokemon have to be added to sate the Poke-lust of the Poke-fanatics?
Geno over Bowser Jr. is a little weird, but I can see Sakurai doing something like that. I mean, Wario seemed like an obvious choice, and yet Ice Climbers made it into Melee and he didn't. Go figure.
Marth is still left out? Seriously? Ice Climbers make the leap from Melee to Brawl, heck, SHIEK makes the jump from Melee to Brawl, but not Marth? That seems a little odd, doesn't it? I know you think Ike will replace Marth to some degree, so that must be what you're thinking here, but it just seems to me that Ike wielding a sword with a large tip seems like a mighty shaky argument to base the removal of a character off of.
As for Sonic... remember: absence of evidence is not evidence of absence. Sure, we haven't heard anything about Sonic, but we haven't heard anything of Snake either since that second trailer. You can't even find a screen shot or profile of him on the Dojo, which is really odd considering that he's a confirmed character. So I wouldn't rule out Sonic just because we haven't heard about it yet. I mean, we only just got confirmation of freakin' WI-FI PLAY a few days ago.
Also remember that SEGA and Nintendo have already gone into talks with each other concerning their respective characters. Surly the two companies couldn't have done all the paperwork necessary for Sonic and Mario to go to the Olympics and not have considered Brawl?
And finally: Sheik. It's nice that you've semi-agreed with me, but don't feel so down about it, as it's highly unlikely that Sheik will return unchanged. Aside from some much needed balancing work for the plucky spud (which is likely, just look at Fox), Sakurai seems to be handling character transformations differently this time around. Just taking what was done with Poke Trainer as an example, it's possible that Zelda has powerful magic that weakens the more she uses it, while sheik gets more and more physically exhausted as she fights, dictating that the characters have to be switched out fairly regularly to keep them at effective levels.