So, who was it?
Fox wasn't a secret anymore (for only god knows why), Mr. Game & Watch was a surprise cameo but not a big role. Any guesses?
Or did marketing mess up and just let slip Fox McCloud's role, & it was something Miyamoto intended (rightfully, if so) to keep secret?
According to this translation, Miyamoto also says "youโll see that thereโs one secret character that plays a big role."
It would be funny if he is referring to Fox McCloud.