This really doesn't mean anything. After the death of those shadow things, can't remember the name, it's obvious square is planning to deviate from the plot of the original game.It's part of the overall story. In the "On the Way to a Smile" book, after her death Aerith is aware while in the lifestream. She's also aware of Sephiroth's presence in the lifestream and can feel his anger, hate and rage, and his intent to change things.
The main take away from the ending of part 1 was that the rest of the story won't follow the original. They're going in a completely different direction.