Bad news everyone, there was an error in the article. There will be no port of Seiken Densetsu... But a brand new game in the series!
It has been confirmed that it is a new game, (co?)developed by Brownie Brown.
Here's a translation of the above article, by FoxSpiritShadow from the Gaming Age boards:
"New FF Appears on Nintendo Hardware, To Release Next Spring
On the 8th, Square made clear that Final Fantasy Chronicle, a game that links the Gamecube console and the GameBoy Advance to play, would be released in spring 2003.
FFCC is set in a fantasy world. On the GBA screen, things like your data are reflected on the TV screen. Play using multiple GBAs is also possible, at times when your energy is low, one can request a friend who is playing on a different GBA's help and attempt to recover, like an online game, there is a strong sense of communication.
FFCC will become the first game to use Fund Q, the fund former president Hiroshi Yamauchi (now chairman) established; it will be developed by Square subsidiary Game Designer Studios, and published by Nintendo. It will become the first game published on Nintendo hardware since 94's Final Fantasy VI.
Square will produce three other titles for the GBA, the same company will sell a game that made the popular Chocobo character the protagonist by the end of the year. Following that, the company will also put out a complete remake of the strategy RPG that sold over 2 million copies, Final Fantasy Tactics.
Also, in the summer of 2003, teaming up with Nintendo development subsidiary Brownie Brown, Square plans to release a new title in the over 4 million selling Seiken Densetsu series. As the developers of the Seiken Densetsu series, working with the producer of the series from Square, they will revive the popular game."
LINK!