According to @ashtonisVULCAN from Infinity Ward on Reddit, the new 1.06 patch update has gone live in Modern Warfare.

This update features some general fixes, tank changes, and the addition of Kill Confirmed/Night Vision modes. Take a look at the exact notes here:

• More fixes to prevent crashes and improve stability across all platforms
• Battlechatter has been removed from tactical, one-life modes
• APCs and Tanks in Ground War no longer award points towards a nuke
• Fix for charms affecting weapon performance when firing from the hip
• Claymores: Stun grenades can now force claymores into a disabled state for 3 seconds
• Footsteps: Adjustments to tame the 3rd person footsteps. They will now filter out based on occlusion more.
• Fix to an issue where Tac Inserts could cause players to spawn out of bounds
• Fix for the gold camo not unlocking on the .357
• Playlist Update
  • NVG (TDM only)
  • Ground War
  • Gunfight
  • Kill Confirmed
  • FFA

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You can have a look at the previous patch notes here