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World of Warcraft: Mists of Pandaria (the 4th expansion for the 8 year running title), released September 25, 2012, has boosted a dropping user subscriber rate. The most significant loss came in the span of three months totaling roughly 1 million subscribers. With this newest expansion, subscription rates have once again risen over the 10 million mark (attributable to the 2.7 million units sold in its first week).

Details on future expansions or a completely new release of the franchise, with graphic and gameplay overhauls, have not yet been announced.

[Gamasutra]