I can't imagine the movie not having either Aerith or Sephiroth get revived in some form. Personally, as long as it makes sense, I don't care what happens.

What do I NOT want in the movie?

Hmm, I'm not very picky, I think I'll be happy so long as the movie doesn't end with Cloud defusing a bomb 0.01 second before it explodes and destroys the Earth.