A few weeks ago, I found a rumor on a Japanese blog saying that people who reserved Brawl on Amazon were getting e-mails saying that the game may be delayed again because they are trying to place in all the characters everyone wants. Also, keep in mind Sakurai's language when the delay was announced, he said that he was hoping that he would complete development without incident. He does not guarantee that the remainder of development time will be smooth. The lack of characters he is showing on the Dojo and his refusal to show the game's character selection screen despite Brawl being about 1.5 months away from its Japanese release is a bit disconcerting.
He did not even do this with Melee. He orignally marked the space where Zelda was on the Melee screen as a question mark, leading a lot of people to believe that Sheik was a hidden character. However, this changed prior to release as we all know. Also, the character selection screen was able to make people have reasonable guesses for a probable roster, the range for the total characters ranged from 19 at minimum and 27 at maximum (there was quite a bit of debate as whether there would be hidden character-selection boxes).
Since we do not know the character selection screen, we have absolutely no idea how many characters there are going to be in Brawl, on some days he is dropping hints that character roster will have a low number of character (less than 36) while other days it can be inferred that there will be a lot of characters (40+). If he is still placing in characters at this point in development, I predict Brawl to be even more broken than Melee, because obviously the delay would not have been to balance the game then. Also, if he is still putting in characters at this point in development there is a good chance that Brawl may be delayed again, if he decides for Brawl not be horribly unbalanced.
Also, to those who are expecting something special out of CoroCoro, I think the most we will be getting out of it will be all the Final Smashes that have not been shown yet on the site, and maybe Falcon and Sheik as well. I am just becoming increasingly pessimistic and irked by Sakurai's obsession with secrecy.