In an article I came across, it was announced that a Call of Duty 4 patch is finally on its way to our consoles. Some things include quick mute option, new kill cams, improved spectator mode, host migration, and improved sniper \ ACOG accuracy. now i can use my ACOG more.

Source:

http://news.teamxbox.com/xbox/15700/Call-of-Duty-4-Patch-Heads-to-Microsoft-for-Certification/