September's content drop will allegedly contain the unannounced 'Gulch', 'Boardwalk' and 'Parish' maps, according to MP1st.
A leaked video, which has since been removed, contained footage the 'Parish' map, which takes place near the remains of a war torn cathedral, featuring occupied streets and a bar.
'Gulch' is described as an open map with strong flanks and will reportedly take place near an abandoned mining settlement in Utah. 'Boardwalk', meanwhile, takes place in and around an old pier, complete with cafes and gift shops.
Recent content drops have added maps such as Decommission, which provides shoreline-based combat among the wreckage of decommissioned ocean liners, and Offshore, which takes place on an oil rig in the middle of the ocean.
Players have also received the free Terminal map, based on Modern Warfare 2's 'No Russian' mission.
Call of Duty: Black Ops 2 has been revealed as the next entry in the military shooter series.
An unannounced Call of Duty title is also currently in development by former Guitar Hero and Tony Hawk studio Neversoft.
Watch a trailer for Call of Duty: Elite below: