Premium members on the Xbox 360 will receive the content on the 5th of Wednesday while members on PS3 will receive it a day later, on the 6th of Thursday.
The content pack on the Xbox 360 will include three new multiplayer maps: Gulch, Parish and Boardwark. On the PS3 the pack will feature Spec Ops missions Light ‘Em Up and Special Delivery; as well as the new Special Ops Chaos mode.
To download the new content you can go to their respective stores through the Modern Warfare 3 multiplayer menu. Off course the store will be updated on the release date mentioned (above).
The DLC Collection 3 will be landing on the PC and PS3 next week. It will include new face off maps: Vortex, U-Turn and Intersection. It will also include Special Ops missions called Vertigo and Arctic Recon. All this plus the PS3 content mentioned above.