Call of Duty Elite has just been updated to reveal that as your clan levels up, you unlock in-game emblems at certain levels. The picture above shows one of the emblems you unlock at Clan Level 2, but click here to see all of the emblems your clan can unlock.
Currently, if your clan has passed a level in which a emblem was unlocked, you should be getting it. No ETA is known for when to expect them to unlock in MW3. We’ll update when more details are announced.
SOURCE: Call of Duty Elite [Thanks to @moriarty1975 for posting the image]