According to “an industry insider who recently visited Blizzard Headquarters,” Blizzard are working on bringing a StarCraft MMO to life. This has come about due to the strong popularity of the StarCraft games, and the reaction of fans to the unofficial mod World of StarCraft.
Blizzard has already said to be working on another new MMO, Project Titan, but this is thought to be separate from that.
The company recently listed a job for “a creatively minded and talented individual to serve as tools engineer” on an “unannounced game title”.
This still looks like a rumor on the flimsy side but maybe BlizzCon later this year will give us some more clues.