Yeah everything in that trailer I was like "...Yeah, OK, I can get on board with that" until the ghost stuff. That alone raised a number of concerns.

1) What is this New Thing? Change is scary.
2) The moment where Cloud and Aerith met in the original was not a moment where Aerith panics and begs for help. As everyone else runs away around her due to the chaos from the reactor, she approaches you and kindly asks if you would like to buy a flower. No hint of fear, just the nice flower girl selling flowers.
3) Aerith never really seemed to be the "help me!" type. I really hope that's not indicative of her overall character in the remake.