Infinity Ward has announced that a new title update is now available for Call of Duty: Modern Warfare 3. According to a forum post by Infinity Ward creative strategist Robert Bowling, the update includes the following balance tweaks and bug fixes:
Fire rate normalization for Assault Rifles with undermounts
FMG9 Re-balancing (Nerf)
Akimbo FMG9 Re-balancing (Nerf)
Type95 Re-balancing (Nerf) - Reduce hipspread.
Fix for ACR with Red Dot / Shotgun
Fix Type 95 bug related to dropping it.
Fix map exploits on Dome
Bowling also confirmed that more updates are currently in development, including updates to the Spawn system, a fix for the shotgun's extended mags, further "lag compensation" or "host advantage/disadvantage" updates, and more.