The 'Chaos Pack' will launch on August 9, while the 'Final Assault' collection releases on September 6.
Both packs will release as timed Xbox 360 exclusives, costing 1200 Microsoft Points each (£10.80/$15).
'Chaos Pack' adds new maps, Spec Ops missions and a game mode. New missions are named 'Vertigo', 'Arctic Recon', 'Light 'Em Up' and 'Special Delivery', while Face Off maps include 'Vortex', 'U-Turn' and 'Intersection'.
Chaos Mode, meanwhile, sees players attempt to outlast waves of enemies, chaining together kills on power-up-heavy maps. It takes place on the 'Resistance', 'Village', 'Underground' and 'Dome' maps.
September's pack features the recently outed 'Gulch', 'Boardwalk' and 'Parish' maps, as well as 'Offshore' and 'Decommission', the latter two taking place on abandoned oil rigs and rotting ocean liners respectively.
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: