Even if Apple doesn't, there is nothing so bad in Aqua as to render it unusable. After all, people put up with Windows or various UNIX interfaces, and so far Aqua looks far superior to those. By mining the NeXT interface for the most valuable parts, grafting them to the successful Mac interface and adding new behaviors, Apple is aiming to make something more modern, something that is able to grow in the future. As long as they still consider older reliable Mac behaviors, then things should come out all right. These features should give you an idea of what Apple is trying to do.
Aqua interface is more visual, seems to have a translucent and jelly-like theme.