Perks confirmed

Bling – Use two attachments on a weapon. No more choosing between the red dot sight and grenade launcher!
Scavenger – Auto-grab ammo from enemy corpses. This is great for maintaining a steady supply of grenades.
Commando – Increase melee range for those extra-lungey knife attacks.

Kill streaks Confirmed

UAV (3 kills) – Exposes enemy locations on your radar. This is the very same unmanned aerial vehicle from CoD 4. So what makes*the perk*different in Modern Warfare 2? They can be shot down. Actually, everything can be shot down.
Care Package (4 kills) – Throw down a special smoke grenade to call in an airdrop of goodies on your location. Your reward might be something simple, like an ammo refill, or something awesome, like an instant advanced kill streak. The catch is that everyone, including enemies, can see the packages location on their radar. This isn’t necessarily a drawback, however, as they can be used as bait for ambushes.
Predator Missile (5 kills) - Try not to hit yourself as you guide a fly-by-wire missile from the heavens to the ground. It’s very effective, and scores you an excellent view of your enemies’ positions for some bonus intel.


2 Deathstreaks Confirmed
After three consecutive deaths with no kills, players are awarded a little bonus of their choice (assuming they’ve unlocked all of them). The default bonus is Copycat, which allows a player to steal his killer’s class for one round, and get a taste of the weapons and perks of a more advanced player. The next one unlocked, and the last one we saw, is Painkiller, which affords players 10 seconds of extra health after they respawn – great for when you’re being spawn camped.

New attachments

Akimbo is not a perk, it is an attachment, dont know why
Tactical Knife is also available, not to sure how this will function

Etc.
Silenced Snipers, woot for all you sniper lovers out there
Silenced shotguns
Riot shields can take about 2 full clips of damage
Tactical Insertion lets you place a marker on the map that can be used as a respawn point until destroyed

Great Stuff. Thanks for the Summary