I personally think they will reuse some of the actors that they used in Kingdom Hearts.
Like Yuffie (Christy Carlson Romano), Aeris (Mandy Moore) and Cloud (Steve Burton).
They won't screw us over. Square has enough money to put good people into the perspective slots.
EDIT--
I left this out before accidently. In Kingdom Hearts (I'm sure diehard FF fans played it like me) James Lance Bass (Yes the guy from NSYNC) was used as the voice for Sephiroth.
Square might re-use him for this movie.
Reply With Quote