Here is a list of some of the new killstreaks and perks that have been released into MW3. I don't have all the information on some of them but it is likely they will get changed in some way before the game releases in early November. These first four are Team Perks which will be awarded to a specific team during the match. There may be more added at some point.
Stopping Power: Increased bullet damage.
Blast Shield: Not sure on the details just yet
Health Regeneration: Regenerate health over time.
Stun Protection: Prevents being stunned from flash grenades.
Some New perks coming to Modern Warfare 3 include:
Blind Eye: This makes you immune to computer and player-controlled killstreaks. Pro version increases your launchers lock on speed and grants extra bullet damage to vehicles.
Assassin: This makes you invisible to UAV, thermal, and heartbeat sensors. Pro version also makes you immune to CUAV, EMP and no longer displays your name in red or the crosshair in red when you're targeted.
Point Guard: Every two assists count as one kill towards your killstreak.
Dead Silence: You do not make any noise.
Recon: Grants a special radar to spot enemies, most likely. I'm not 100% sure on this one.
I haven't found out which of the previous perks will be making a return yet, but I'm sure there will be a few of them
There will also be several new killstreaks to employ in multiplayer. Here's the rundown on the latest thinking:
EMP Grenade: Temporarily takes out area electronics.
Littlebird: A small-manned helicopter that can controlled and used to gun down enemies.
Precision Airstrike: Calls in an airstrike on a targeted area.
Stealth bomber: Calls in a B2 Bomber to carpet bomb along a specified path.
Remote Turret: A remote controlled turret.
Directional UAV: A UAV that can be directed by the user into specific areas to scan for enemies.
Remote Mortar: Direct a mortar strike using a camera that zooms in on the map for precise strikes.
Airdrop Trap: A booby-trapped airdrop.
Ammo Resupply: An ammo reloading airdrop.
Escort Airdrop: A protected airdrop.
Specialist Strike Package: This one is a mystery so far.
While it's very likely that some killstreaks will added or removed, I have heard that they will be removing the Tactical Nuke Killstreak altogether.
