Is this a new line ?

There doesn't seem to be maps on
http://www.ratp.fr/ParisVisite/Eng/Pla_q/f_pla.htm

??

Also is there any benefit/difference between taking the roissybus vs the RER
from Charles de Gaulle to the centre of Paris. The bus seems a fraction
cheaper.

Finally I am looking for 10 unusal things to do in Paris - i.e. touristy
things, but having been there about 20 times before, not the usual touristy
things - Any suggestions ?