World of Warcraft subscriber numbers drops to 9.6 million in Q4

During today's Activision Blizzard investor call, it was announced that during the fourth quarter of 2012, World of Warcraft dropped below 10 million to 9.6 million subscribers. Considering Mists of Pandaria launched in late Q3, it surprising to see that numbers have dropped already. Subscriptions were down to 9.1 before Mists of Pandaria, then jumped to 10 million in Q3 and are now back on their way down.