So, btw, know the theory about how Sakurai might've changed trailers?
I've checked the dates. Tomorrow is the anniversary of Fire Emblem: New Mystery of the Embled for DS, Wednesday is the anniversary of Fire Emblem: Blazing Sword in Europe, and today is the anniversary of F-Zero X.
There is no way the trailer was "replaced" at the last minute. Sakurai just trolled everyone, including the leaker, and the leaker (who probably doesn't have access to any more information anyway because the idiot probably got himself fired) fell for it like the rest of us did.
There is still the question of Sakurai's statement about the roster being defined from the start. If we take it at face value, Sakurai never once planned to make Chrom playable. I mean, its possible he had planned Chrom at first, but I'm not so sure.