This topic is far too much discussed, patience is a virtue
As for now, it's impossible to say if it ever makes it comeback to the Ps3, allthough i have read from an interview with a SE dude that ...
Interviewer : " There has been alot of discussion about the FF VII technical demo you did for Ps3, is there a possibility that there would actually be a remake process going on, or have you even thought of remaking the game ? "
SE-dude : " At this point all i have to say is NO, we have'nt given it a more serious though after the demo was released. Only thing i can tell you is that you should'nt let all hope down, since the descicion to make Final Fantasy 12 was made in 12 seconds "
I can't remember the exact place i read that from, but it was a gaming fest in japan earlier this year, so yeah, patience is a virtue, all we can do, is wait
ps. They'll remake it at last at the point where they need more money :)