*Im not so sure if this is true but people have being saying for a while now that Krystal was confirmed for split second on the Dojo. The day the “Krystal information” went up was the same day as Dedede's revelation, leading some conspiracy theorists to think that Krystal was meant to be revealed then but the character was changed for unknown reasons.
*Also supposedly an Official Nintendo magazine hints Krystal being the NEXT CHARACTER to be revealed filling up the newcomer row. Not sure what magazine it was...
*This however is true. News leaked onto the internet that Alésia Glidewell, the voice actress(VA) who did Krystal’s English voice in Assault, will be doing the voice acting for Krystal in Super Smash Bros. Brawl. The source of the leak? Alésia herself! As you can see on her website, she lists Krystal from Star Fox as one of the voices she supplied in Brawl (in addition to Knuckle Joe and Zero Suit Samus).
This doesn’t confirm anything at this time other than the fact that Krystal will be in the game and she will speak. However, this could potentially be as a playable character, an assist trophy, or as another type of non-playable character (think the secret messages that Fox and Falco could get on Star Fox levels in Melee). But Just days after the Krystal in Brawl leak, Alésia Glidewell removed the information from her website, leaving a hole in its place. Fortunately, someone figured that would happen and made a backup. The links below...
files.dwightdesign.com/ka/articles/support/snagbuddy_productions.pdfIf Krystal was held back in favor of Dedede, it's likely that Sakurai wanted to hold her back to build up suspense during the delay period.
As for why the VA info disappeared, it's likely that Nintendo of America found out about the leak and ordered Krystal's VA to remove the credits from her website. The general consensus is that there's no reason why they would have taken it off unless Krystal was anything less than a playable character, so her chances of being announced are even higher.
Anyways, we have the voice, we have a new comer slot, we have supposedly leaked updates..... I'm betting Krystal will be the NEXT and FINAL character revealed on the Dojo possibly replacing Falco.