World of Warcraft's global subscriber base now numbers over 10 million, and several of those subscribers can even log in and play!
In all seriousness, Blizzard did announce that its MMO is experiencing "growth across all major regions," not to mention that it sold 3.3 million copies of the Warlords of Draenor expansion in its first 24 hours.
Blizzard defines subscribers in its press release:
World of Warcraft subscribers include individuals who have paid a subscription fee or have an active prepaid card to play World of Warcraft, as well as those who have purchased the game and are within their free month of access. Internet game room players who have accessed the game over the last thirty days are also counted as subscribers. The above definition excludes all players under free promotional subscriptions, expired or cancelled subscriptions, and expired prepaid cards. Subscribers in licensees' territories are defined along the same rules.