VW had said before that it was done to connect the cars of today with the cars of the past. Think Chrysler 300 or Dodge Charger in this situation. They want to be able to draw in the older customers on the Rabbit name, and the younger customers on the value that the Rabbit will come to represent. Also, I think added to the mix is that the Golf is so often called a "chick" car, and the Rabbit will hopefully turn that name around.
We will see...