All of these things that I saw in the trailer their some of the are probably in the wiki but I just want to let you guys know :)
RC Bomb - Remote controlable car and it looks like it has a c4 attached to it that you can detonate - 3 Killstreak
MP5k - You can see it when before the player picks up the camera spike
Commado - The gun the player was using and it seems that his red dot sight has a smile face in the middle if you look closely and obviously when the player reloads he has a smiley face patch in his gun :) and a compressor which means most probably means bling is back or something like bling
Ark Angel - Thats what I'm gonna call it because thats what i heard :) it looks like this kill streak is like the predator missile but you can fully control this up,down,left,right - 5th kill streak
Semtex - I'll call it that for the moment but it does look like it but instead it lights up green DD: and it got stuck in the enemies bawls .-.
Crossbow - We all know about this it sticks to the player and then BOOOM
Ballistic knife - Like the throwing knife but this get launched by a spring you get 2 ballistic knifes and for a split second you can see in the trailer that you can pick up the knife as one of my viewers told me I went and double check. and you can :)
Famas - D: its back dom dom dom in its prototype version fires automatic
L96AW (aka. AWM) sniper rifle - my friend told me this. this gun is when the guy gets raped by the ark angel/coolio predator missile.
Launch - The map where the spaceship goes boom
Camouflage - D: surprising its back....
Python Snub Nose - For a split second we see it
Claymore - Its a perk most probably :)
Boeing CH-47 Chinook - Its a big helicopter but turns out it only drops a care package just 1 not 2 but 1....
Attack Helicopter - Attack helicopter is back most probably a 7th killstreak
Dolphin dive - You see a guy dive across the screen which is probably a perk as people were talking about
M16A1 - We didn't see it here but it's going to be in the game and its the fully automatic version of the M16
Summit - Map we saw in the beginning of the video. Snowy terrain
Map callouts - in the mini map there's callouts (e.g: B4,C4 on launch)