Well that was the rumor blizz, It was supposedly written into the plot. The deal was that you would first have to help the guy in the pipe in midgar with some sort of medicine, then you would have to hope that it was Aries that you went on a date with at the gold saucer. Finally, on the third cd, you would need to get the key to midgar and go back to the church in the slums, which would then give you the ability to ask her to join you again and something like that. Anyway, supposedly the key was removed that would allow you to help the guy in the pipe and Cloud would merely say "Listen, I'm no doctor." (which he does) And when you go back to the church on the third CD, you'll see a ghost image of Aries, but it fades away to be replaced by the kids taking care of the garden (which it does). However, if you could revive her, it would ruin the ending movies/storyline so I don't see how that could work.