Reports from Japan have "winked" on the fact that Golden Sun will be coming to GameCube's RPG titles. Golden Sun and its sequel, The Lost Age, received great popularity and were very successful. Making a transition from GBA to Gamecube could also make it a commercial success. Rumours reprinted by UK website TotalVideoGames suggest that the game may feature some form of multiplayer, although the site qualifies this by saying that it's "simply too early to tell at this stage."
News source: gamesindustry.biz
