Ve3tro.com A supposed games tester has leaked information regarding Call of Duty: Modern Warfare 2 on Fourzerotwo’s twitter live blog. It would appear that the play tester was removed/banned after posting this details, which leads to it being a little more feasible.

• Vehicles will be in MW2
• M16 will return, using stopping power will only be OHK at head, neck, and torso (abdomen, limbs, and hands/feet will not)
• Ak47 and M4 will return, unknown if there are any changes
• M40 will return, ACOG damage boost will be fixed
• Scorpion, P90, M21, R700, G3, G360 will not return
• There are more unknown weapons that will not return
• New sniper rifle: SR25M (United states forces)
• New Assault rifle: Diemeco C8 (Canadian forces M4 equivelant)
• New Assault rifle: L85A2 (United Kingdom forces)
• Total weapons in multiplayer are said to be around 35
• Favourite Modern warfare 1 maps will return

• Helicopters, Air-Strikes and U.A.V will return
• Red dot sightings will come in different shapes for multi-player (circular, square, original)
• Snipers will have special grass camouflage (As seen in Modern warfare 1’s campaign)
• All perks will return from MW except eavesdrop and others will be altered
• All gametypes will return from MW and all will have hardcore versions
• New gametype: Secure (Call of duty version of capture the flag, however you capture the enemy’s Intel)
• New gametype unconfirmed name, similar to search and destroy, however instead of trying to plant a bomb, you try to kill a specified enemy
• Solider customization for each class (and each country)
• Sniper with silencers will NOT be in multiplayer
• There are NO bots in local multiplayer

• Similar version to Nazi Zombies, however details are unknown
• NO guest players online, 1 player per console
• Killcam save feature
• There is blood and gore
• Offline/Online Co-op
• Story takes place in the Middle East
• Role as US marines return
• Ken Lally voice work in campaign
• Release is set for sometime in November
• New army tags will be available to add different elements in campaign (similar to halo skulls)
• Campaign-only weapons

Thanks to Mr-Pants on the IGN forums for finding this info!