Perks
Tier 1
Extreme Conditioning - Sprint longer distances + Climb obstacles faster
Sleight Of Hand - Reload faster + Faster weapon swapping
Scavanger - Reload ammo from bags + Spawn with more ammo
Blind Eye - Undetectable from air support + Faster launcher lock on and extra damage to air support
Recon - Explosive damage marks target on HUD + Bullet damage marks target on HUD
Perks
Tier 2
Hardline - One less kill for Killstreak + Two assists count as a kill towards next killstreak
Assassin - Immune to UAV, Motion Sensor, Thermal and Heartbeat Sensor + Immune to CUAV & EMP
Overkill - Two primary weapons + Second primary can have 2 attachments
Quickdraw - Faster aim down sights + Faster animation of using equipment and throwing grenade
Blastshield - Flack Jacket (Immune to most explosives) + Immune to stuns and flashes
Perks
Tier 3
Sitrep - Enemy equipment is visible + Enemy footsteps are more clear
Dead Silence - Your footsteps are silent + No fall damage
Stalker - Faster movement with ADS + Delay on claymores
Marksman - ID target from range + Longer hold breath on scoped weapons
Steady Aim - Increased hip fire accuracy + Faster aim down sight while sprinting
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Source:
www.mw3forum.comNothing has been confirmed, just thought I'd like to share.