sorry when you now think that a Secret of Mana is announcet for gamecube it is not . . . but i WISH that it will be announcet!!

And may be soon Square do so because it said that they develope FF:Christal Chonical(GCN/GBA), FF:Tactics(GBA), ChocoboWorld(GBA), SeikenDensetsu(jap.for Secret of Mana) for GBA and it also said that Sqaure is develope three other GBA titles and two other GCN titles.
Rumors said that one of the GCN titles is a new Secret of Mana wich you can connect with the GBA game like FF:CC. The GBA titles may be ChronoTrigger, FF5 and FF6.
That would be really great but for now just rumors.