WoodysGamertag released a video summing up 402's QA. Here is an outline of the important things,
  • The Dolphin Dive will not return to MW3
  • Currently there is the ability to "quickscope"
  • IW plans to fully support MW3 post-launch (includes hot fix ability)
  • OMA , Commando , Second Chance have been dropped from MW3
  • Spec-Ops mode is confirmed to only be 2 players max
Here is the video,