@Young Horsetail: Goroh, Krystal, and Starfy would have been the honorary mentions.
Do you think both King K. Rool and Dixie Kong will get in? Or with it be 1 or the other?
A good majority of us here agree that both of them will get in.
K. Rool: is hugely popular and notable.
Dixie: is just as notable, though not as popular, but has the advantage of being planned for Brawl (on the basis that she'd pull the tag team gameplay from DKC with Diddy, so yes she would have had her own moveset. But complications with it forced her to be cut, to which remember that Sakurai said the roster was mostly done already by the announcement of Brawl at E3 06).
What are your thoughts about the Pokemon reps? I figure Mewtwo, Lucario, and Zoroark is too much, not to mention the possibility of a 6th gen rep. Will Lucario get cut? Will Mewtwo return?
Mewtwo: Was planned for all three games, cut for time in two (the reason for in Brawl is unknown, a good bet would be Jiggs offered more), as is the most popular character for the next game who saw much rage over being removed in Brawl. Nuff said.
Lucario: For one thing, Sakurai doesn't care about sales or generations. Lucario himself was well received in Brawl and there's little reason to remove him especially when he's more popular than his possible competition.
Zoroark: Is okay popular, most of it though is on the basic idea of removing Lucario, rather than actually wanting her. For the most part is the flagship 5th Gen Pokemon. However both of her competition are much more popular than her and most have a hard time seeing her offering much moveset wise. Including her really just depends on whether or not you dislike either Lucario or Mewtwo or if you think Sakurai wants a new character in-comparison to what he already has.
6th Gen: Without going into what a possible new Pokemon could be like, development on this game started around Feb-March and from what we know much of the ground work of the game was already finished months ago. It's an obvious bet that this game missed Gen 6 by a year or so.
General consensus is at least 5 Pokemon (always with Pikachu, an unchanged Red and usually Jiggs), though some you'll find with 6 in order to get all the Pokemon newcomers on (it could have happened in Brawl, and over representation, in the way most people see it, doesn't matter).
What about Fire Emblem? Roy is highly requested in Japan, Ike was a Brawl favorite, but Chrom's game sold really well. Marth is pretty much a given, but what will happen here? Will Roy return and/or Ike get cut? Will Chrom replace Ike?
Ike: Arguably the most well received of the lords and is by far one of the most popular. There's literally no reason to cut him.
Roy: After Mewtwo, he's the most popular character for the next game. That said he was cut and he is a bit out there now, but he was planned for Brawl and chances are more than likely he would have been decloned (Ike's Eruption?).
Chrom: FE13 is a huge hit, and so is this character. He does however borrow a lot from previous lords (Marth's sword, Roy's non-fire special abilities, and a bit of Ike's design and Aether, though Chrom's Aether acts differently) and may not have much to offer.
Really comes down to who you think has more to offer moveset wise between Roy/Chrom or if Sakurai yet again comes to IS asking for a new character. And yes 3 FE characters is general consensus.
Will Shulk's 1 appearance be enough to warrant a spot in the roster?
Having only one appearance doesn't hurt Shulk, heck it's become a big well received and cult hit game (another Earthbound?). However, being from a new and unproven franchise does hurt him a bit based on Sakurai interviews from Brawl (ex. Nintendo doesn't have very many IPs left, the last Gen only had Pikmin and Animal Crossing).
I also forgot to mention that Saki is also another big character who is seen likely while I'm remembering.
Is another F-Zero rep likely at all? GameFAQs doesn't really think so.
Everyone generally wants an F-Zero rep, so it's just up to Sakurai and his whimsy. Everyone agrees it'd be either Goroh or Black Shadow, the former being the better bet.
Lastly I was wondering how large you think the roster will be. And with that, will cuts be made for more newcomers. GameFAQs is pretty undecided about cuts, but at least within the realm of possibility is Toon Link, Ike, Lucas, and Lucario. I have strong feelings that all 3 Star Fox characters will stay, but there are others that don't. Lucario is agreed to probably be most in danger of being cut though.
I don't really know how to explain roster size, but most have around 48-54 characters including the transformations.
Toon Link is the same difference as Young, not really a cut, and either way is not in danger. Ghirahim is another Zelda one shot like Skull Kid or Wolf Link & Minda. Tingle is Tingle.
Ike and Lucas aren't in danger of being cut, they're both staple characters in both of their series and are very popular and unique fighters.
Lucario, as I previously said Sakurai doesn't care about sales or Generations. In both the Smash and Pokemon scene Lucario stands out very well, he's arguably the most well known non-Gen 1 out there. Was well received for Smash and has a very unique moveset that lends itself to Smash well. The fear of him being replaced comes from not knowing how Sakurai chooses characters, lack of experience in both Smash or Pokemon fanbases, and Mewtwo having been cut.