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Treyarch’s Game Design Director David Vonderhaar has been teasing the Call of Duty community on twitter recently. He’s had several profile picture changes the last couple of days it seems. No word yet on if we’re looking at prestige or callsign emblems. The last emblem probably isn’t game related as he added it when the (U.S.) Football Pre-season started.
UPDATE (8/12/12): 6th emblem added
TmarTn seems to think the emblems are related to a new “Multiplayer League” system which might include new matchmaking and ranking. Check out his video below: