When will you people learn that you can post more then one image in each post? lol 
Anyway, there is a ton of gaemplay videos on Gametrailers.com these days, it's Xbox360, but I guess it's more orl ess the same. There are also a presentation video explaining a bit about the new perks, weapons, killstreaks bla bla. This is what I got so far from that one. LINK: http://www.gametrailers.com/video/press-event-modern-warfare/56086
-There are now 9 killstreak rewards.
3 kills: UAV
4 kills Care package (Helicopter drops a create with ammo or a random killstreak award)
4 kills Counter-UAV
5 kills Sentry Gun (WTH?)
6 kills Predator Missile (manual guided missile)
7 kills Precision Airstrike (It reads that you can now decide which direction it will arrive from)
8 kills Attack Helicopter (I guess AH-1 and Mi-24, same as in CoD4)
9 kills Pawe Low (It says "Heavy armored helicopter")
11 kills AC130 (Oh boy!)
Now, I'm not 100% sure but I think you can choose by yourself what killstreak you want to get active by pre-selecting..
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-New ways of customizing and selecting weapons.
You still got 5 classes you can customize (I was hoping for more), but the selection within these classes are greater.
Primary Weapon
-This is the same as it used to Assault Rifles, Sub Machine Guns, Light Machine Guns and Sniper Rifles.
Secondary Weapon *CHANGED*.
-Has changed a bit, but I think the "Overkill" perk is still in. Handguns, Shotguns, Machine Pistols & Launchers
Equipment *NEW*.
-This is totally new and contains special items such as Frag grenades, Semtex grenades, Throwing knife, Tactical insertion (throw it and you can spawn where it landed next time you die, can also be destroyed), blast shield and a few more which were classified in this presentation.
Special Grenades.
-All the same: Stun, Flashbang and Smoke.
Perk 1
-A couple of new perks, but I wasn't able to read the detailed discription. Marathon (longer runs I guess), Sleight of Hand (faster reload), Scavenger *NEW* (???) Bling *NEW* (I think it said something about having two attachments on your weapon) & two classified.
Perk 2
-Stopping Power (weapons does greater damage, same as before), Lightweight *NEW* (???), Hardline *NEW* (???), Cold-Blooded (I think this is to counter the thermal imaging thingy you can get on your weapon. Kinda like camoflage perk in WaW) & one classified
Perk 3
-Commando *NEW* (Increase melee distance. Normal or throwing knife, I don't know), Steady Aim (speaks for itself), Scrambler *NEW* (probably to avoid UAV), & three classified.
Death Streak *NEW*
-Well, I didn't quite catch what he ment, but I think it is a way to help players which isn't doing so well by letting them have killcam after 4 deaths without kills, etc. Not sure.
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-Weapons
I'm not sure how many of the old weapons survived but here are a list of the ones I saw on the video clips.
Assault Rifles
-M4A1, FAMAS *NEW*, SCAR-H *NEW*, TAR-21 *NEW* & L85A1 *NEW* (Gameplay video)
Machine Pistols
-PP2000 *NEW* & G18 *NEW*
Shotguns
-SPAS-12 & AA-12 *NEW*
Handguns
-USP .45 *NEW* & .44 Magnum *NEW*
Launchers
AT4 *NEW* & Thumper *NEW*
AND THATS IT FOR NOW, WE'LL JUST HAVE TO WAIT TILL NOVEMBER!! 
