Call of Duty Rio is receiving new maps with new factions regularly! More 5 maps added to the game since the release of 3.1 version.
Already online you will find:
Pedreira Engenho da Rainha
Pedreira Engenho da Rainha (Noite)
Favela do Rodo
Favela do Rodo (Noite)
And very soon, an amazing remake of the map Highrise from Modern Warfare 2...