FF3? I thought FF7 was the one widely regarded as a classic?
They will only release a remake when:
A) The money is needed/correct B) They make a better game in their view. With I suppose, overwhelming success.
You can probably expect to see II and IV on Android within a year if they continue to sell well, but probably not V or later until they're ported to a portable game system first. I know there were reports of preliminary work on V/VI for DS but nothing beyond that.
Also, to clarify, Chrono Trigger was Square's opus :)