This is the new pass "Paris à la Carte Plus", you can easily travel from Roissy CDG airport to the centre of Paris (Porte Maillot, Place de l'Etoile/Arc de Triomphe, Gare de Lyon, Gare Montparnasse) with the Air France coach service.
http://www.pariscityrama.com/en/paris-a-la-carte
