Yoichi Wada, the president of Square-Enix said in a recent interview with Reuters that it's possible that Final Fantasy and Dragon Quest games will be released on PlayStation 3 and Xbox 360. Yoichi Wada didn't say anything about a possible Final Fantasy title on the Revolution.
Yoichi Wada didn't gave any certainty concerning these titles, but indicated that more will be reveiled during E3 2006 by Square Enix.