The bill defines what area will be covered. It is essentially all the parliamentary precinct and the grounds as well. You won't have the distinction that you have now.
The bill also allows the Speaker to designate in writing any another area. If for some reason, for construction or another reason, the House or the Senate needs to move to another building, this building could be designated as subject to parliamentary privilege and to protective services. You now have a very clear definition in the bill that designates both the grounds and the parliamentary precinct.