Some Gamestops are going to be running a Smash event in a couple of weeks (where I live, it's the biggest store in the area).
If you guys go to that event, go early, get your play time out of the way, then go talk to the Nintendo rep overseeing it.
CoroCoro is not going to leak anything. They can't leak anything. Nintendo takes the secrecy of this stuff way too seriously. Heck, look at the treehouse. Even in-company, people have to play this stuff behind closed doors. Nintendo literally has a team that hunts down leaks, determines who in the company made the leak, and they will terminate jobs over that (and they are good at tracking down even anonymous leaks).
For CoroCoro to have anything to leak, they would have to be performing corporate espionage on Nintendo, which would get them sued into the Stone Age.
They have whatever Nintendo gives them and authorizes them to present, and nothing else. Even if they have a review copy of the game, the reviewer would be under a NDA even with his own coworkers. Copies of this game are closely monitored by Nintendo when they are given out or even just demoed.
If Ridley is revealed, it's either going to be as a post-release hidden character (which, from one point of view, makes sense; it would reveal him as hype to the American fans who want him more during the gap) or it will be revealed by Sakurai.