Source - The Magic Box
Square has completed its plans to release every Final Fantasy game on a modern format with the announcement of Final Fantasy III for the GameBoy Advance. That's Japanese III, not the American one, which was Japanese VI, for those confused. Details were first discovered in Japanese gaming magazine V-Jump, and FFIII's transition means that Final Fantasies I and II will appear on PSone, III and Tactics will now appear on GBA, and Fantasies IV-IX are already available on PSone. X onwards appear on PlayStation 2. Then there are the GameCube releases, and the WonderSwan oddities, but you get the general idea. There is no news as-yet on whether the GBA Fantasies will appear in Europe.