[[SS]Chief]

Not sure on how accurate this information will be? I got it from here:

Details on the popular FPS have been coming out steadily lately, both on purpose and accident. This would be classified under accident since the complete list of Killstreaks and Perks has been leaked. Take a look.
Killstreaks
Assault
4 Kills – Care Package
5 Kills – IMS – 3 or 4 placeable landmines that cannot be stunned or flashed
5 Kills – Predator Missile
5 Kills – Sentry Gun
6 Kills – Precision Airstrike
7 Kills – Attack Helicopter
7 Kills – Little Bird Flock – Mini Helicopters which patrol the map
9 Kills – Little Bird Guard – Big Helicopter that follows you from above and protects you
9 Kills – Mortar team – Mortar team but with 5 predator missiles – all go off at the same time in different places
10 Kills – Talcon – Mini Tank Robot
12 Kills – AC130
12 Kills – Pavelow
15 Kills – Juggernaught Suit – From spec Ops*
Support
4 Kills – UAV
5 Kills – Counter UAV
5 Kills – Ballistic Duffel – Drop Juggernaught perk for the whole team (not the suit)
5 Kills – Airdrop Trap – Drops a hacked care package
8 Kills – Sam Turret
10 Kills – Remote UAV – Target enemies with missiles
12 Kills – Advanced UAV – Blackbird
12 Kills – Remote Turret – Sentry Gun that can be controlled by the player
12 Kills – Stealth Bomber
18 Kills – EMP
18 Kills – Juggernaught Recon Armour – Care Package Drop Armour
18 Kills – Escort Airdrop – Drops 5 care packages, one will be hacked
Specialist
2 Kills – You get 1 extra perk**
4 Kills – Get another perk**
6 Kills – Get another perk**
Perks
Tier 1
Extreme Conditioning – Sprint longer distances [PRO] Climb obstacles faster
Sleight Of Hand – Reload faster [PRO] Faster weapon swapping
Scavanger – Reload ammo from bags [PRO] Spawn with more ammo
Blind Eye – Undetectable from air support [PRO] Faster launcher lock on and extra damage to air support
Recon – Explosive damage marks target on HUD [PRO] Bullet damage marks target on HUD
Tier 2
Hardline – One less kill for Killstreak [PRO] Two assists count as a kill towards next killstreak
Assassin – Immune to UAV, Motion Sensor, Thermal and Heartbeat Sensor [PRO] Immune to CUAV & EMP
Overkill – Two primary weapons [PRO] Second primary can have 2 attachments
Quckdraw – Faster aim down sights [PRO] Faster animation of using equipment and throwing grenade
Blastshield – Flack Jacket (Immune to most explosives) [PRO] Immune to stuns and flashes
Tier 3
Sitrep – Enemy equipment is visible [PRO] Enemy footsteps are more clear
Dead Silence – Your footsteps are silent [PRO] No fall damage
Stalker – Faster movement with ADS [PRO] Delay on claymores
Marksman – ID target from range [PRO] Longer hold breath on scoped weapons
Steady Aim – Increased hip fire accuracy [PRO] Faster aim down sight while sprinting.
*In a recent video, the player obtained the Juggernaut Suit at 15 kills, but he had Hardline on.
**The Specialist Killstreaks let you choose which perk you get each time.
Now you can start getting an idea of how you want to craft your custom classes.