They didn't reset peoples leaderboards when MW2 released. Think about it, November 9th doesn't start at the exact same time all around the world. People in the UK will get it 5 hours before stores release it in the US. So how would they know what time to reset the stats at? If the reset it at 12:00 A.M. where Treyarch is, it would screw over the people who have been playing legit since it's release overseas.