[Opinion] You should probably be less excited for new Smash Brothers characters
It's likely that all of the new characters for the new Smash Brothers have already been announced.
This could all just be speculation and I would love to be proven wrong. But I think it's incredibly unlikely that any new characters will be added to the new Smash roster. Before the game went into development Sakurai stated that there wouldn't be that much of a focus on expanding the roster this time around. Later on he's said that at this point no one from Brawl has been removed from the roster.
The development team knows that what the fans love most about this series is new characters and I'd assume they know if they don't nip it in the bud then everyone will be disappointed when so few new characters are released so they've already announced all of the new additions in Mega Man, The Villager and the Wii Fit Trainer as if saying 'There's your new characters now leave us alone."
This is why all of the announcement since then have been returning characters. Now I really hope I'm wrong on this and there's still some possible hope considering the following:
The statements mentioned before were said some time ago, thing's might've changed, or that some new characters might be kept secret until or near the game's launch as a bit of a surprise.
Some people noticed that the 3DS version features a stage from the recent Fire Emblem Awakening, and it would make sense to think that a character from that game would be replacing Ike, (who was the newest character in the Fire Emblem series at the time of Brawl's release), as the New Fire Emblem character alongside Marth, who was recently announced so it would make sense that Chrom would make an appearance.
This is of course my opinion and I really want to be proven wrong so if you have any other theories, statements or even proof please share because I hope it doesn't go down this way.