I read an interview someone did with one of the developers and I remember him saying that they had a bunch of ideas that they had to drop due to time constraints(EA is famous for pressuring their developers to push the the product out the door finished or not by the date they set for release).
They are probably maps that were started by had to be dropped for that reason. Hopefully, as they are already there they will use them in any future patch or whatever. EA never gives you something for free though, one way or another you will have to pay.
------------------
