FFV and FFVI I think are practically confirmed ("We didn't them on DS for the graphics",FF will be on 3DS).
FFVII?I've heard there is a deal between Square and Sony,because Sony should have helped Square in the development,so,it could appear only on Sony consoles...but never say never!
And I think Square will be not in the group of SH that will provide the 30 games for 3DS launch (at least,in Europe)







