Ok for whatever reason I try to hide info in my posts I don't know for purposes of rewarding the smart? I've decided maybe I should present it more openly. Before you say this has already been posted on the front of Dtoid, there actually MORE information here than on that post.
Frag: Old standard in explosives.
Semtex: A sticky timed explosive, try running from this one when it's on your ass.
Throwing Knife: Kills instantly and can be retrieved infinitely.
Tactical Insertion Flare: Can be deployed as a personal respawn point, however can be stepped on and crushed by the enemy.
Blast Shield: A face mask than can be worn to reduce explosive damage, however it removes the minimap.
Akimbo: This is treated as an attachment and must be attached to be used on the appropriate weapon. You can dual wield sub-machine guns, pistols, and machine-pistols.
Silencer: This can be attached to shotguns as well as sniper rifles.
FMJ: This replaces the perk Deep Impact from Modern Warfare 1. Allowing increased penetration.
Shotgun: Can be attached to an assault rifle.
Heartbeat Sensor: I think you can pretty much guess. Honestly I'm not to sure about this and it's place in the game, all I have to say is Ninja baby.
Extended Magazines: Increases the capacity of your mags.
Grips: Lowers the recoil
Rapid Fire: Takes the place of double tap, however unknown if it increases as much as double tap or just increases the over all rate of fire.
Perk Slot 1
Marathon | Marathon Pro
Marathon Perk Ability: Unlimited sprint.
Pro Ability: Get over obstacles faster.
Sleight of Hand | Sleight of Hand Pro
Sleight of Hand Perk Ability: Faster reloading.
Pro Ability: Gives a speed boost to how fast you can aim down the sight of your weapon.
Scavenger | Scavenger Pro
Scavenger Perk Ability: Full resupply from dead enemies.
Pro Ability: Extra magazines.
Bling | Bling Pro
Bling Perk Ability: 2 primary weapon attachments.
Pro Ability: 2 secondary weapon attachments.
One Man Army | One Man Army Pro
One Man Army Perk Ability: Replaces your secondary weapon. This allows you to change your class at any given time during a match.
Pro Ability: Swaps classes even faster.
Perk Slot 2
Stopping Power | Stopping Power Pro
Stopping Power Perk Ability: Increased bullet damage.
Pro Ability: Increased bullet damage vs. helicopters and aircrafts.
Lightweight | Lightweight Pro
Lightweight Perk Ability: Move faster.
Pro Ability: ?
Hardline | Hardline Pro
Hardline Perk Ability: Killstreaks require 1 less kill.
Pro Ability: Death Streaks require 1 less death.
Cold-Blooded | Cold-Blooded Pro
Cold-Blooded Perk Ability: Undetectable by UAV, air support, sentries, and thermal.
Pro Ability: ?
Danger Close | Danger Close Pro
Danger Close Perk Ability: Increases explosive weapons damage.
Pro Ability: ?
Perk Slot 3
Commando | Commando Pro
Commando Perk Ability: Increased melee distance.
Pro Ability: Same as above, plus you don't take damage from falling.
Steady Aim | Steady Aim Pro
Steady Aim Perk Ability: Increased hip-fire accuracy.
Pro Ability: Just like the Iron Lungs perk from Call of Duty 4. You can hold your breath for a longer period of time.
Scrambler | Scrambler Pro
Scrambler Perk Ability: Scrambles (jams) the enemy radar in a small radius.
Pro Ability: ?
Ninja | Ninja Pro
Ninja Perk Ability: Invisible to heartbeat sensors.
Pro Ability: Allows you to move silently. Equivalent to the Dead Silence perk from COD4.
SitRep | SitRep Pro
SitRep Perk Ability: Insertions. This will reveal enemy explosives and Tactical Insertions.
Pro Ability: Louder enemy footsteps.
Last Stand | Last Stand Pro
Last Stand Perk Ability: This allows you to survive a normal death. You will drop to the ground and pull out your pistol.
Last Stand ends after ~10 seconds or if you get shot again, which results in your death. You can also crawl in the Last Stand mode.
Pro Ability: Same as above, but this allows you to use your equipment too.
UAV Description: This deploys a UAV (unmanned aerial vehicle) that shows the enemies on the radar as dots. The UAV can be shot down by the enemy.
This can be blocked with the Cold-Blooded perk.
Care Package Description: After you throw the red signal flare, the Care Package will be airdropped into the battlefield. This can be picked by anyone, even the enemy.
The package contains either a random killstreak or ammo. The killstreak can be anything from the UAV to the Tactical Nuke, regardless what killstreak rewards you have chosen.
Care Package Screenshot In-game screenshot
Counter-UAV Description: This disables the enemy radar for a short period of time.
Sentry Gun Description: Airdrops a placeable XM312 Sentry Gun that will automatically fire at enemies. It can be destroyed by normal means, or temporarily disabled with Flashbangs and Stun Grenades.
The Sentry Gun has a full 360 degree turn on its turret and can pitch up and down. You can move the Sentry Gun around even after you've deployed it, but it won't fire until it's placed. They are most effective when placed in high places.
Predator Missile Description: This allows you to remote control a Predator missile. After opening the laptop, you have approximately 5 seconds to control the missile to your target, as it goes down. You can also give the missile a boost to make it go down faster.
You are vulnerable while using the Predator missile, but if you get killed, you can still continue to control it.
Precision Airstrike Description: This is much like the Airstrike from Call of Duty 4, but this time you can control the direction of the Airstrike for more accurate kills.
Harrier Strike Description: Airstrike with a hovering Harrier. After dropping its bombs, the Harrier will guard the area for a short period of time.
Attack Helicopter Description: Deploys a helicopter to the battlefield like in Call of Duty 4. It will circle the map and automatically attack the enemies for a few minutes and leave. It can be destroyed with guns and missiles.
All the enemies that it kills are added to your kill count.
Emergency Airdrop Description: Airdrops 4 random killstreaks or ammo. This is the same as the Care Package, but x4.
Pave Low Description: This deploys a heavily armored Attack Helicopter (Sikorsky MH-53 Pave Low) to the map for maximum carnage. As with the Attack Helicopter, all the kills are added to your kill count.
Stealth Bomber Description: Calls in a Stealth Bomber (B-2 Spirit) to carpet bomb the selected area. You can also control the direction, just like with the Precision Airstrike.
The airstrike doesn't show on enemy radar.
Chopper Gunner Description: Be the gunner of an attack helicopter. The chopper will fly around the map and you can remotely control the 25mm gun with your laptop.
AC-130 Gunship Description: After the AC-130 Gunship is deployed via laptop, it will enter the map. You control it remotely for 30 seconds and you can use the 25mm, 45mm and 105mm guns to shoot at enemies. You are vulnerable while controlling the AC-130, but if you get killed while using it, you can still continue.
Note: The AC-130 can be shot down by the enemy, but it does have flares as countermeasures.
EMP Description: Electromagnetic pulse or EMP for short. Temporarily disables enemy electronics.
Tactical Nuke Description: Gives you and your team an instant win. The Tactical Nuke ends the match with a bang by killing everyone on the map.
3 deaths without a kill
Painkiller Description: Big health boost for a limited time when you respawn.
4 deaths without a kill
Copycat Description: Copy your killer's class (Weapons, Perks and Attachments) in killcam.
? deaths without a kill
Martyrdom Description: Drop a grenade when killed.
Final Stand Description: Just like the Last Stand perk, but you can use your primary weapon.
More info and much pretty display of said info: http://www.themodernwarfare2.com/ read