In a recent interview in Japan Expo, Paris, the creator of FINAL FANTASY X tells to Final Fantasy Dream redactors that a FINAL FANTASY X-0 was nearly to be produced...

FINAL FANTASY DREAM : If FFX/X-2 HD Remaster meets a big success, do you will think about bringing new parts to the story with new games emphasizing on the origin of FFX and his heroes Braska, Jecht and Auron ?

Motomu Toriyama : "When we made X-2, you see it was a very good history with three girls in an adventure together. We actually had an idea and we wanted to make a different game featuring Jecht, Auron and Braska. That kind of people in the previous era to the newest generation. So if we had to do that, we have to create a boot story… with all kind of grown-up man and female travelling together. So that would require a lot of work. It’s was a good idea and we nearly wanted to do that but it didn’t happen... so probably not. "

Source : http://n4g.com/news/1319214/ffx-0-was-very-envisaged/