Please continue discussions in that thread.
MW3 Spec Ops Survival Trailer
There are a lot of features which can be seen in the video: Friendly Reinforcements,weapon upgrades, kill streak rewards, attack dogs, riot shields, Juggernauts and more.
The video can be seen at http://www.youtube.com/watch?v=BxDQ2Ow-VfI&feature=channel_video_title
"In Survival, you will fight off waves of increasingly difficult enemies as you earn XP and unlock several types of armories to expand your arsenal and load-out customizations along the way.
Unlock new upgrades and missions as you gain XP and increase in level throughout the Survival experience. Survival Challenges along with leaderboards allow you to compete against your friends and prove once for all, who is the best soldier"