Gameplay from the new MW3 map - Black Box.
(Gameplay from Xbox...)

Battlefield 3: Close Quarters Click fo rmore information
In Battlefield 3: Close Quarters, players are dropped into a frantic, infantry-only theatre of war. Frostbite 2 high definition destruction makes the environment come alive as everything from furniture to plaster gets shot to pieces. Players will feel the intensity of the world exploding around them as rubble and broken pieces pile up on the floor, while tight level design and vertical gameplay create a highly competitive environment. Battlefield 3: Close Quarters also introduces new weapons, assignments and unique dog tags to bring back to the base game.
Get plunged into frantic and relentless infantry combat.

• Check your corners as death can come from any angle
• HD destruction lets you reduce entire locales to ruin
• Earn new weapons and bring them back to the base game
• Complete new assignments and equip unique dog tags
• Play in new ways, mixing team play and instant action

Battlefield 3: Armored Kill – Following the tight infantry gameplay of Battlefield 3: Close Quarters, DICE will release Battlefield 3: Armored Kill that ups the ante for vehicular mayhem as only Battlefield can do. Featuring new driveable tanks, ATVs, mobile artillery and more, Battlefield 3: Armored Kill also delivers huge battlefields for an all-out vehicle assault, including the biggest map in Battlefield history.

Battlefield 3: End Game – The fourth expansion pack will ship in the winter but details remain tightly guarded.