Battlefield 3 will feature a total of 6 helicopters, with 2 attack helicopters per side, 2 transport helicopters, and 2 recon helicopters for the US and Russian side, respectively.
AH-1 Super Cobra

Battlefield 3 cobra
The Cobra was the main attack helicopter in Battlefield 2, and will reprise its role in Battlefield 3. The Cobra was introduced back in 1971, and is still in use today across several US armed forces.
UH-1Y Venom

BF3 huey
The Bell UH-1Y Venom is based on the famous Huey helicopter, but the UH-1Y is equipped with upgraded navigation and electronics, new rotors and updated engines, as well as increased speed and payload capability. The Super Huey is set to make its debut in Battlefield 3 for the first time. The Venom will replace the Black Hawk in Battlefield 3 as the main transport helicopter for the US forces.
AH-6J Little Bird

BF3 little bird
The Little Bird first appeared in Battlefield 2 as a part of the Armored Fury expansion pack, and is set to return in Battlefield 3. The Little Bird is a small, fast and nimble attack and recon helicopter which seats only two, but features an array of firepower, from machine guns to rockets, and can also transport a squad of 4 soldiers on a special platform on its sides.
Mil MI28

MI28
The Mil MI28 is the Russian counterpart to the AH64 Apache. It has been used since 1996 in the Russian army, and is also used in other nations, most noticeably, Venezuela. The Mil MI28 was previously featured in Bad Company 2.
KA-60 Kasatka

Battlefield 3 Kamrov KA60
The Kamrov KA-60 will make its Battlefield debut in Battlefield 3. The chopper is a new Russian design that was introduced in 1998 as a fast reconnaissance helicopter, and for transporting air-assault forces. In addition, the helicopter can be equipped with radio-electronic jammers.
Z-11

Battlefield 3 Z11
The Z-11 is a Chinese-made fast attack and recon helicopter, used across China among police and special forces. The Z-11 will make its first appearance in Battlefield 3.
AH64 Apache

AH64 Apache
Introduced in 1975, the Boeing AH64 Apache has been in service ever since and is the main attack helicopter of the United States. It’s one of the first vehicles to be confirmed in Battlefield 3. The Apache is used around the world by nations such as the United Kingdom, Japan, Egypt, among others. UPDATE: it has been confirmed that the Apache won’t be in Battlefield 3.
Mil MI24

MI24
The Mil MI24 is Russia’s most popular helicopter, and the main helicopter gunship. It has two pilots who can engage a variety of targets, and also seats 4 passengers. UPDATE: it has been confirmed that the MI24 won’t be in Battlefield 3.
UH60 Black Hawk

blackhawk
The UH60 Black Hawk is the main transport helicopter of the US military units, and has been confirmed for Battlefield 3. It can seat 5 soldiers, with a pilot, two gunners and two passengers. UPDATE: it has been confirmed that the Black Hawk won’t be in Battlefield 3, however it is still possible that we’ll see it in the Back to Karkand expansion.