Square Enix has filed a trademark for "Hereos of Mana". Is this a new game in the Seiken Densetsu series? It seems so since a few developers of this game are from previous Seiken Densetsu games. The game is being developed for Nintendo DS.
Update: I found something interesting after I posted this news. It's an online petition where fans wanted Seiken Densetsu 3 to be released to the rest of the world. They suggested that "Heroes of Mana" as the "western world's" name of the game. Could Square Enix finally listened to the fans?
Link to petition