Square announced today their Gameboy Advance schedule from now until next summer. Three new games were revealed, along with the already announced Final Fantasy Tactics New Work (Temporary Title). FFT is due out sometime this winter, along with another Chocobo title; it's unclear right now if it will be another Chocobo's Mysterious Dungeon title or something more along the lines of Working Chocobo that released on the WonderSwan Color.
The third game on the release schedule is Seiken Densetsu (Temporary Title), which is due for release next summer. The final title is Final Fantasy Crystal Chronicle, which is currently scheduled to be released next spring. Square has promised some sort of connectivity between the GBA game and a GameCube counterpart, although at this point details are scarce.
And for the ten people who will e-mail me after this article is posted, no, Square does not currently have release plans for any of these games in the US, Europe, Australia, or Africa.