I have suspected for some time that it may be being saved for an HD port or a future compilation (like FF Anthology or a multi-game HD remix). Something which would move it out of the PSP range, and give added purchase incentive.

However, I do find it interesting that SkyBladeChaos's fan translation has not yet been ordered a cease and desist, despite it's recent public announcement (which is giving a status update indicating around 35 to 50 percent completion).