I was looking at rumors of MW3 Killstreaks when I decided to put one together. Tell me if you like this post. I will try to get the confirmed killstreaks when they are leaked but for now here are my predictions:

3 Killstreak - UAV
4 Killstreak - Counter UAV
4 Killstreak - Care Package
5 Killstreak - Airstrike
5 Killstreak - Predator Drone (Drone instead of Missile, new name)
6 Killstreak - Remote Control UAV (Almost like BC2, easy to shoot down)
6 Killstreak - Sentry Gun
7 Killstreak - Missile Strike (Airstrike but drops Missiles in 3 Specific Areas, but not in a line, it can be any 3 areas)
7 Killstreak - Helicopter
8 Killstreak - Harrier
8 Killstreak - B-2 Bomber Strike (Stealth Bomber, new name)
9 Killstreak - Emergency Airdrop (Moves from 8-9 because it is a better achievement to get than Stealth Bomber)
9 Killstreak - Pave Low
11 Killstreak - Chopper Gunner (Hopefully not as Overpowered, because this killstreak was insane in MW2, but Black Ops managed to make it suitable)
13 Killstreak - AC-130 (Moves from 11-13 because it is a powerhouse and I believe it is being developed by Sledgehammer Games to be more deadly)
25 Killstreak - Nuke (However, you must get all 25 kills with no air support, only the individual can kill 25 players and get the nuke)

Those are my predictions, hope you enjoyed reading

P.S. these three killstreaks have been confirmed:
UAV (3 Killstreak)
Counter-UAV (4 Killstreak)
AC-130 (Either 11 or 13 Killstreak)